Linear Algebra Examples

$[\begin{array}{c} 2 & 7 \\ 5 & 3 \end{array}] x = [\begin{array}{c} - 3 & 8 \\ 7 & - 9 \end{array}]$

Step 1

Check if the function rule is linear.

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Step 1.1

To find if the table follows a function rule, check to see if the values follow the linear form $y = a x + b$ .

$y = a x + b$

Step 1.2

Build a set of equations from the table such that $y = a x + b$ .

$- 3 = a (2) + b 8 = a (7) + b 7 = a (5) + b - 9 = a (3) + b$

Step 1.3

Calculate the values of $a$ and $b$ .

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Step 1.3.1

Solve for $b$ in $- 3 = a (2) + b$ .

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Step 1.3.1.1

Rewrite the equation as $a (2) + b = - 3$ .

$a (2) + b = - 3$

$8 = a (7) + b$

$7 = a (5) + b$

$- 9 = a (3) + b$

Step 1.3.1.2

Move $2$ to the left of $a$ .

$2 a + b = - 3$

$8 = a (7) + b$

$7 = a (5) + b$

$- 9 = a (3) + b$

Step 1.3.1.3

Subtract $2 a$ from both sides of the equation.

$b = - 3 - 2 a$

$8 = a (7) + b$

$7 = a (5) + b$

$- 9 = a (3) + b$

$b = - 3 - 2 a$

$8 = a (7) + b$

$7 = a (5) + b$

$- 9 = a (3) + b$

Step 1.3.2

Replace all occurrences of $b$ with $- 3 - 2 a$ in each equation.

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Step 1.3.2.1

Replace all occurrences of $b$ in $8 = a (7) + b$ with $- 3 - 2 a$ .

$8 = a (7) - 3 - 2 a$

$b = - 3 - 2 a$

$7 = a (5) + b$

$- 9 = a (3) + b$

Step 1.3.2.2

Simplify $8 = a (7) - 3 - 2 a$ .

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Step 1.3.2.2.1

Simplify the left side.

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Step 1.3.2.2.1.1

Remove parentheses.

$8 = a (7) - 3 - 2 a$

$b = - 3 - 2 a$

$7 = a (5) + b$

$- 9 = a (3) + b$

$8 = a (7) - 3 - 2 a$

$b = - 3 - 2 a$

$7 = a (5) + b$

$- 9 = a (3) + b$

Step 1.3.2.2.2

Simplify the right side.

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Step 1.3.2.2.2.1

Simplify $a (7) - 3 - 2 a$ .

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Step 1.3.2.2.2.1.1

Move $7$ to the left of $a$ .

$8 = 7 a - 3 - 2 a$

$b = - 3 - 2 a$

$7 = a (5) + b$

$- 9 = a (3) + b$

Step 1.3.2.2.2.1.2

Subtract $2 a$ from $7 a$ .

$8 = 5 a - 3$

$b = - 3 - 2 a$

$7 = a (5) + b$

$- 9 = a (3) + b$

$8 = 5 a - 3$

$b = - 3 - 2 a$

$7 = a (5) + b$

$- 9 = a (3) + b$

$8 = 5 a - 3$

$b = - 3 - 2 a$

$7 = a (5) + b$

$- 9 = a (3) + b$

$8 = 5 a - 3$

$b = - 3 - 2 a$

$7 = a (5) + b$

$- 9 = a (3) + b$

Step 1.3.2.3

Replace all occurrences of $b$ in $7 = a (5) + b$ with $- 3 - 2 a$ .

$7 = a (5) - 3 - 2 a$

$8 = 5 a - 3$

$b = - 3 - 2 a$

$- 9 = a (3) + b$

Step 1.3.2.4

Simplify $7 = a (5) - 3 - 2 a$ .

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Step 1.3.2.4.1

Simplify the left side.

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Step 1.3.2.4.1.1

Remove parentheses.

$7 = a (5) - 3 - 2 a$

$8 = 5 a - 3$

$b = - 3 - 2 a$

$- 9 = a (3) + b$

$7 = a (5) - 3 - 2 a$

$8 = 5 a - 3$

$b = - 3 - 2 a$

$- 9 = a (3) + b$

Step 1.3.2.4.2

Simplify the right side.

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Step 1.3.2.4.2.1

Simplify $a (5) - 3 - 2 a$ .

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Step 1.3.2.4.2.1.1

Move $5$ to the left of $a$ .

$7 = 5 a - 3 - 2 a$

$8 = 5 a - 3$

$b = - 3 - 2 a$

$- 9 = a (3) + b$

Step 1.3.2.4.2.1.2

Subtract $2 a$ from $5 a$ .

$7 = 3 a - 3$

$8 = 5 a - 3$

$b = - 3 - 2 a$

$- 9 = a (3) + b$

$7 = 3 a - 3$

$8 = 5 a - 3$

$b = - 3 - 2 a$

$- 9 = a (3) + b$

$7 = 3 a - 3$

$8 = 5 a - 3$

$b = - 3 - 2 a$

$- 9 = a (3) + b$

$7 = 3 a - 3$

$8 = 5 a - 3$

$b = - 3 - 2 a$

$- 9 = a (3) + b$

Step 1.3.2.5

Replace all occurrences of $b$ in $- 9 = a (3) + b$ with $- 3 - 2 a$ .

$- 9 = a (3) - 3 - 2 a$

$7 = 3 a - 3$

$8 = 5 a - 3$

$b = - 3 - 2 a$

Step 1.3.2.6

Simplify $- 9 = a (3) - 3 - 2 a$ .

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Step 1.3.2.6.1

Simplify the left side.

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Step 1.3.2.6.1.1

Remove parentheses.

$- 9 = a (3) - 3 - 2 a$

$7 = 3 a - 3$

$8 = 5 a - 3$

$b = - 3 - 2 a$

$- 9 = a (3) - 3 - 2 a$

$7 = 3 a - 3$

$8 = 5 a - 3$

$b = - 3 - 2 a$

Step 1.3.2.6.2

Simplify the right side.

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Step 1.3.2.6.2.1

Simplify $a (3) - 3 - 2 a$ .

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Step 1.3.2.6.2.1.1

Move $3$ to the left of $a$ .

$- 9 = 3 a - 3 - 2 a$

$7 = 3 a - 3$

$8 = 5 a - 3$

$b = - 3 - 2 a$

Step 1.3.2.6.2.1.2

Subtract $2 a$ from $3 a$ .

$- 9 = a - 3$

$7 = 3 a - 3$

$8 = 5 a - 3$

$b = - 3 - 2 a$

$- 9 = a - 3$

$7 = 3 a - 3$

$8 = 5 a - 3$

$b = - 3 - 2 a$

$- 9 = a - 3$

$7 = 3 a - 3$

$8 = 5 a - 3$

$b = - 3 - 2 a$

$- 9 = a - 3$

$7 = 3 a - 3$

$8 = 5 a - 3$

$b = - 3 - 2 a$

$- 9 = a - 3$

$7 = 3 a - 3$

$8 = 5 a - 3$

$b = - 3 - 2 a$

Step 1.3.3

Solve for $a$ in $- 9 = a - 3$ .

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Step 1.3.3.1

Rewrite the equation as $a - 3 = - 9$ .

$a - 3 = - 9$

$7 = 3 a - 3$

$8 = 5 a - 3$

$b = - 3 - 2 a$

Step 1.3.3.2

Move all terms not containing $a$ to the right side of the equation.

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Step 1.3.3.2.1

Add $3$ to both sides of the equation.

$a = - 9 + 3$

$7 = 3 a - 3$

$8 = 5 a - 3$

$b = - 3 - 2 a$

Step 1.3.3.2.2

Add $- 9$ and $3$ .

$a = - 6$

$7 = 3 a - 3$

$8 = 5 a - 3$

$b = - 3 - 2 a$

$a = - 6$

$7 = 3 a - 3$

$8 = 5 a - 3$

$b = - 3 - 2 a$

$a = - 6$

$7 = 3 a - 3$

$8 = 5 a - 3$

$b = - 3 - 2 a$

Step 1.3.4

Replace all occurrences of $a$ with $- 6$ in each equation.

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Step 1.3.4.1

Replace all occurrences of $a$ in $7 = 3 a - 3$ with $- 6$ .

$7 = 3 (- 6) - 3$

$a = - 6$

$8 = 5 a - 3$

$b = - 3 - 2 a$

Step 1.3.4.2

Simplify the right side.

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Step 1.3.4.2.1

Simplify $3 (- 6) - 3$ .

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Step 1.3.4.2.1.1

Multiply $3$ by $- 6$ .

$7 = - 18 - 3$

$a = - 6$

$8 = 5 a - 3$

$b = - 3 - 2 a$

Step 1.3.4.2.1.2

Subtract $3$ from $- 18$ .

$7 = - 21$

$a = - 6$

$8 = 5 a - 3$

$b = - 3 - 2 a$

$7 = - 21$

$a = - 6$

$8 = 5 a - 3$

$b = - 3 - 2 a$

$7 = - 21$

$a = - 6$

$8 = 5 a - 3$

$b = - 3 - 2 a$

Step 1.3.4.3

Replace all occurrences of $a$ in $8 = 5 a - 3$ with $- 6$ .

$8 = 5 (- 6) - 3$

$7 = - 21$

$a = - 6$

$b = - 3 - 2 a$

Step 1.3.4.4

Simplify the right side.

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Step 1.3.4.4.1

Simplify $5 (- 6) - 3$ .

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Step 1.3.4.4.1.1

Multiply $5$ by $- 6$ .

$8 = - 30 - 3$

$7 = - 21$

$a = - 6$

$b = - 3 - 2 a$

Step 1.3.4.4.1.2

Subtract $3$ from $- 30$ .

$8 = - 33$

$7 = - 21$

$a = - 6$

$b = - 3 - 2 a$

$8 = - 33$

$7 = - 21$

$a = - 6$

$b = - 3 - 2 a$

$8 = - 33$

$7 = - 21$

$a = - 6$

$b = - 3 - 2 a$

Step 1.3.4.5

Replace all occurrences of $a$ in $b = - 3 - 2 a$ with $- 6$ .

$b = - 3 - 2 \cdot - 6$

$8 = - 33$

$7 = - 21$

$a = - 6$

Step 1.3.4.6

Simplify the right side.

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Step 1.3.4.6.1

Simplify $- 3 - 2 \cdot - 6$ .

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Step 1.3.4.6.1.1

Multiply $- 2$ by $- 6$ .

$b = - 3 + 12$

$8 = - 33$

$7 = - 21$

$a = - 6$

Step 1.3.4.6.1.2

Add $- 3$ and $12$ .

$b = 9$

$8 = - 33$

$7 = - 21$

$a = - 6$

$b = 9$

$8 = - 33$

$7 = - 21$

$a = - 6$

$b = 9$

$8 = - 33$

$7 = - 21$

$a = - 6$

$b = 9$

$8 = - 33$

$7 = - 21$

$a = - 6$

Step 1.3.5

Since $8 = - 33$ is not true, there is no solution.

No solution

Step 1.4

Since $y \neq y$ for the corresponding $x$ values, the function is not linear.

The function is not linear

Step 2

Check if the function rule is quadratic.

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Step 2.1

To find if the table follows a function rule, check whether the function rule could follow the form $y = a x^{2} + b x + c$ .

$y = a x^{2} + b x + c$

Step 2.2

Build a set of $3$ equations from the table such that $y = a x^{2} + b x + c$ .

Step 2.3

Calculate the values of $a$ , $b$ , and $c$ .

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Step 2.3.1

Solve for $c$ in $- 3 = a \cdot 2^{2} + b (2) + c$ .

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Step 2.3.1.1

Rewrite the equation as $a \cdot 2^{2} + b (2) + c = - 3$ .

$a \cdot 2^{2} + b (2) + c = - 3$

$8 = a \cdot 7^{2} + b (7) + c$

$7 = a \cdot 5^{2} + b (5) + c$

$- 9 = a \cdot 3^{2} + b (3) + c$

Step 2.3.1.2

Simplify each term.

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Step 2.3.1.2.1

Raise $2$ to the power of $2$ .

$a \cdot 4 + b (2) + c = - 3$

$8 = a \cdot 7^{2} + b (7) + c$

$7 = a \cdot 5^{2} + b (5) + c$

$- 9 = a \cdot 3^{2} + b (3) + c$

Step 2.3.1.2.2

Move $4$ to the left of $a$ .

$4 \cdot a + b (2) + c = - 3$

$8 = a \cdot 7^{2} + b (7) + c$

$7 = a \cdot 5^{2} + b (5) + c$

$- 9 = a \cdot 3^{2} + b (3) + c$

Step 2.3.1.2.3

Move $2$ to the left of $b$ .

$4 a + 2 b + c = - 3$

$8 = a \cdot 7^{2} + b (7) + c$

$7 = a \cdot 5^{2} + b (5) + c$

$- 9 = a \cdot 3^{2} + b (3) + c$

$4 a + 2 b + c = - 3$

$8 = a \cdot 7^{2} + b (7) + c$

$7 = a \cdot 5^{2} + b (5) + c$

$- 9 = a \cdot 3^{2} + b (3) + c$

Step 2.3.1.3

Move all terms not containing $c$ to the right side of the equation.

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Step 2.3.1.3.1

Subtract $4 a$ from both sides of the equation.

$2 b + c = - 3 - 4 a$

$8 = a \cdot 7^{2} + b (7) + c$

$7 = a \cdot 5^{2} + b (5) + c$

$- 9 = a \cdot 3^{2} + b (3) + c$

Step 2.3.1.3.2

Subtract $2 b$ from both sides of the equation.

$c = - 3 - 4 a - 2 b$

$8 = a \cdot 7^{2} + b (7) + c$

$7 = a \cdot 5^{2} + b (5) + c$

$- 9 = a \cdot 3^{2} + b (3) + c$

$c = - 3 - 4 a - 2 b$

$8 = a \cdot 7^{2} + b (7) + c$

$7 = a \cdot 5^{2} + b (5) + c$

$- 9 = a \cdot 3^{2} + b (3) + c$

$c = - 3 - 4 a - 2 b$

$8 = a \cdot 7^{2} + b (7) + c$

$7 = a \cdot 5^{2} + b (5) + c$

$- 9 = a \cdot 3^{2} + b (3) + c$

Step 2.3.2

Replace all occurrences of $c$ with $- 3 - 4 a - 2 b$ in each equation.

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Step 2.3.2.1

Replace all occurrences of $c$ in $8 = a \cdot 7^{2} + b (7) + c$ with $- 3 - 4 a - 2 b$ .

$8 = a \cdot 7^{2} + b (7) - 3 - 4 a - 2 b$

$c = - 3 - 4 a - 2 b$

$7 = a \cdot 5^{2} + b (5) + c$

$- 9 = a \cdot 3^{2} + b (3) + c$

Step 2.3.2.2

Simplify $8 = a \cdot 7^{2} + b (7) - 3 - 4 a - 2 b$ .

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Step 2.3.2.2.1

Simplify the left side.

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Step 2.3.2.2.1.1

Remove parentheses.

$8 = a \cdot 7^{2} + b (7) - 3 - 4 a - 2 b$

$c = - 3 - 4 a - 2 b$

$7 = a \cdot 5^{2} + b (5) + c$

$- 9 = a \cdot 3^{2} + b (3) + c$

$8 = a \cdot 7^{2} + b (7) - 3 - 4 a - 2 b$

$c = - 3 - 4 a - 2 b$

$7 = a \cdot 5^{2} + b (5) + c$

$- 9 = a \cdot 3^{2} + b (3) + c$

Step 2.3.2.2.2

Simplify the right side.

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Step 2.3.2.2.2.1

Simplify $a \cdot 7^{2} + b (7) - 3 - 4 a - 2 b$ .

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Step 2.3.2.2.2.1.1

Simplify each term.

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Step 2.3.2.2.2.1.1.1

Raise $7$ to the power of $2$ .

$8 = a \cdot 49 + b (7) - 3 - 4 a - 2 b$

$c = - 3 - 4 a - 2 b$

$7 = a \cdot 5^{2} + b (5) + c$

$- 9 = a \cdot 3^{2} + b (3) + c$

Step 2.3.2.2.2.1.1.2

Move $49$ to the left of $a$ .

$8 = 49 \cdot a + b (7) - 3 - 4 a - 2 b$

$c = - 3 - 4 a - 2 b$

$7 = a \cdot 5^{2} + b (5) + c$

$- 9 = a \cdot 3^{2} + b (3) + c$

Step 2.3.2.2.2.1.1.3

Move $7$ to the left of $b$ .

$8 = 49 a + 7 b - 3 - 4 a - 2 b$

$c = - 3 - 4 a - 2 b$

$7 = a \cdot 5^{2} + b (5) + c$

$- 9 = a \cdot 3^{2} + b (3) + c$

$8 = 49 a + 7 b - 3 - 4 a - 2 b$

$c = - 3 - 4 a - 2 b$

$7 = a \cdot 5^{2} + b (5) + c$

$- 9 = a \cdot 3^{2} + b (3) + c$

Step 2.3.2.2.2.1.2

Simplify by adding terms.

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Step 2.3.2.2.2.1.2.1

Subtract $4 a$ from $49 a$ .

$8 = 45 a + 7 b - 3 - 2 b$

$c = - 3 - 4 a - 2 b$

$7 = a \cdot 5^{2} + b (5) + c$

$- 9 = a \cdot 3^{2} + b (3) + c$

Step 2.3.2.2.2.1.2.2

Subtract $2 b$ from $7 b$ .

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

$7 = a \cdot 5^{2} + b (5) + c$

$- 9 = a \cdot 3^{2} + b (3) + c$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

$7 = a \cdot 5^{2} + b (5) + c$

$- 9 = a \cdot 3^{2} + b (3) + c$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

$7 = a \cdot 5^{2} + b (5) + c$

$- 9 = a \cdot 3^{2} + b (3) + c$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

$7 = a \cdot 5^{2} + b (5) + c$

$- 9 = a \cdot 3^{2} + b (3) + c$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

$7 = a \cdot 5^{2} + b (5) + c$

$- 9 = a \cdot 3^{2} + b (3) + c$

Step 2.3.2.3

Replace all occurrences of $c$ in $7 = a \cdot 5^{2} + b (5) + c$ with $- 3 - 4 a - 2 b$ .

$7 = a \cdot 5^{2} + b (5) - 3 - 4 a - 2 b$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

$- 9 = a \cdot 3^{2} + b (3) + c$

Step 2.3.2.4

Simplify $7 = a \cdot 5^{2} + b (5) - 3 - 4 a - 2 b$ .

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Step 2.3.2.4.1

Simplify the left side.

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Step 2.3.2.4.1.1

Remove parentheses.

$7 = a \cdot 5^{2} + b (5) - 3 - 4 a - 2 b$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

$- 9 = a \cdot 3^{2} + b (3) + c$

$7 = a \cdot 5^{2} + b (5) - 3 - 4 a - 2 b$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

$- 9 = a \cdot 3^{2} + b (3) + c$

Step 2.3.2.4.2

Simplify the right side.

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Step 2.3.2.4.2.1

Simplify $a \cdot 5^{2} + b (5) - 3 - 4 a - 2 b$ .

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Step 2.3.2.4.2.1.1

Simplify each term.

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Step 2.3.2.4.2.1.1.1

Raise $5$ to the power of $2$ .

$7 = a \cdot 25 + b (5) - 3 - 4 a - 2 b$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

$- 9 = a \cdot 3^{2} + b (3) + c$

Step 2.3.2.4.2.1.1.2

Move $25$ to the left of $a$ .

$7 = 25 \cdot a + b (5) - 3 - 4 a - 2 b$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

$- 9 = a \cdot 3^{2} + b (3) + c$

Step 2.3.2.4.2.1.1.3

Move $5$ to the left of $b$ .

$7 = 25 a + 5 b - 3 - 4 a - 2 b$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

$- 9 = a \cdot 3^{2} + b (3) + c$

$7 = 25 a + 5 b - 3 - 4 a - 2 b$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

$- 9 = a \cdot 3^{2} + b (3) + c$

Step 2.3.2.4.2.1.2

Simplify by adding terms.

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Step 2.3.2.4.2.1.2.1

Subtract $4 a$ from $25 a$ .

$7 = 21 a + 5 b - 3 - 2 b$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

$- 9 = a \cdot 3^{2} + b (3) + c$

Step 2.3.2.4.2.1.2.2

Subtract $2 b$ from $5 b$ .

$7 = 21 a + 3 b - 3$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

$- 9 = a \cdot 3^{2} + b (3) + c$

$7 = 21 a + 3 b - 3$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

$- 9 = a \cdot 3^{2} + b (3) + c$

$7 = 21 a + 3 b - 3$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

$- 9 = a \cdot 3^{2} + b (3) + c$

$7 = 21 a + 3 b - 3$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

$- 9 = a \cdot 3^{2} + b (3) + c$

$7 = 21 a + 3 b - 3$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

$- 9 = a \cdot 3^{2} + b (3) + c$

Step 2.3.2.5

Replace all occurrences of $c$ in $- 9 = a \cdot 3^{2} + b (3) + c$ with $- 3 - 4 a - 2 b$ .

$- 9 = a \cdot 3^{2} + b (3) - 3 - 4 a - 2 b$

$7 = 21 a + 3 b - 3$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

Step 2.3.2.6

Simplify $- 9 = a \cdot 3^{2} + b (3) - 3 - 4 a - 2 b$ .

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Step 2.3.2.6.1

Simplify the left side.

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Step 2.3.2.6.1.1

Remove parentheses.

$- 9 = a \cdot 3^{2} + b (3) - 3 - 4 a - 2 b$

$7 = 21 a + 3 b - 3$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

$- 9 = a \cdot 3^{2} + b (3) - 3 - 4 a - 2 b$

$7 = 21 a + 3 b - 3$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

Step 2.3.2.6.2

Simplify the right side.

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Step 2.3.2.6.2.1

Simplify $a \cdot 3^{2} + b (3) - 3 - 4 a - 2 b$ .

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Step 2.3.2.6.2.1.1

Simplify each term.

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Step 2.3.2.6.2.1.1.1

Raise $3$ to the power of $2$ .

$- 9 = a \cdot 9 + b (3) - 3 - 4 a - 2 b$

$7 = 21 a + 3 b - 3$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

Step 2.3.2.6.2.1.1.2

Move $9$ to the left of $a$ .

$- 9 = 9 \cdot a + b (3) - 3 - 4 a - 2 b$

$7 = 21 a + 3 b - 3$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

Step 2.3.2.6.2.1.1.3

Move $3$ to the left of $b$ .

$- 9 = 9 a + 3 b - 3 - 4 a - 2 b$

$7 = 21 a + 3 b - 3$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

$- 9 = 9 a + 3 b - 3 - 4 a - 2 b$

$7 = 21 a + 3 b - 3$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

Step 2.3.2.6.2.1.2

Simplify by adding terms.

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Step 2.3.2.6.2.1.2.1

Subtract $4 a$ from $9 a$ .

$- 9 = 5 a + 3 b - 3 - 2 b$

$7 = 21 a + 3 b - 3$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

Step 2.3.2.6.2.1.2.2

Subtract $2 b$ from $3 b$ .

$- 9 = 5 a + b - 3$

$7 = 21 a + 3 b - 3$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

$- 9 = 5 a + b - 3$

$7 = 21 a + 3 b - 3$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

$- 9 = 5 a + b - 3$

$7 = 21 a + 3 b - 3$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

$- 9 = 5 a + b - 3$

$7 = 21 a + 3 b - 3$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

$- 9 = 5 a + b - 3$

$7 = 21 a + 3 b - 3$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

$- 9 = 5 a + b - 3$

$7 = 21 a + 3 b - 3$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

Step 2.3.3

Solve for $b$ in $- 9 = 5 a + b - 3$ .

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Step 2.3.3.1

Rewrite the equation as $5 a + b - 3 = - 9$ .

$5 a + b - 3 = - 9$

$7 = 21 a + 3 b - 3$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

Step 2.3.3.2

Move all terms not containing $b$ to the right side of the equation.

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Step 2.3.3.2.1

Subtract $5 a$ from both sides of the equation.

$b - 3 = - 9 - 5 a$

$7 = 21 a + 3 b - 3$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

Step 2.3.3.2.2

Add $3$ to both sides of the equation.

$b = - 9 - 5 a + 3$

$7 = 21 a + 3 b - 3$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

Step 2.3.3.2.3

Add $- 9$ and $3$ .

$b = - 5 a - 6$

$7 = 21 a + 3 b - 3$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

$b = - 5 a - 6$

$7 = 21 a + 3 b - 3$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

$b = - 5 a - 6$

$7 = 21 a + 3 b - 3$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

Step 2.3.4

Replace all occurrences of $b$ with $- 5 a - 6$ in each equation.

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Step 2.3.4.1

Replace all occurrences of $b$ in $7 = 21 a + 3 b - 3$ with $- 5 a - 6$ .

$7 = 21 a + 3 (- 5 a - 6) - 3$

$b = - 5 a - 6$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

Step 2.3.4.2

Simplify the right side.

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Step 2.3.4.2.1

Simplify $21 a + 3 (- 5 a - 6) - 3$ .

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Step 2.3.4.2.1.1

Simplify each term.

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Step 2.3.4.2.1.1.1

Apply the distributive property.

$7 = 21 a + 3 (- 5 a) + 3 \cdot - 6 - 3$

$b = - 5 a - 6$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

Step 2.3.4.2.1.1.2

Multiply $- 5$ by $3$ .

$7 = 21 a - 15 a + 3 \cdot - 6 - 3$

$b = - 5 a - 6$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

Step 2.3.4.2.1.1.3

Multiply $3$ by $- 6$ .

$7 = 21 a - 15 a - 18 - 3$

$b = - 5 a - 6$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

$7 = 21 a - 15 a - 18 - 3$

$b = - 5 a - 6$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

Step 2.3.4.2.1.2

Simplify by adding terms.

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Step 2.3.4.2.1.2.1

Subtract $15 a$ from $21 a$ .

$7 = 6 a - 18 - 3$

$b = - 5 a - 6$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

Step 2.3.4.2.1.2.2

Subtract $3$ from $- 18$ .

$7 = 6 a - 21$

$b = - 5 a - 6$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

$7 = 6 a - 21$

$b = - 5 a - 6$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

$7 = 6 a - 21$

$b = - 5 a - 6$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

$7 = 6 a - 21$

$b = - 5 a - 6$

$8 = 45 a + 5 b - 3$

$c = - 3 - 4 a - 2 b$

Step 2.3.4.3

Replace all occurrences of $b$ in $8 = 45 a + 5 b - 3$ with $- 5 a - 6$ .

$8 = 45 a + 5 (- 5 a - 6) - 3$

$7 = 6 a - 21$

$b = - 5 a - 6$

$c = - 3 - 4 a - 2 b$

Step 2.3.4.4

Simplify the right side.

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Step 2.3.4.4.1

Simplify $45 a + 5 (- 5 a - 6) - 3$ .

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Step 2.3.4.4.1.1

Simplify each term.

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Step 2.3.4.4.1.1.1

Apply the distributive property.

$8 = 45 a + 5 (- 5 a) + 5 \cdot - 6 - 3$

$7 = 6 a - 21$

$b = - 5 a - 6$

$c = - 3 - 4 a - 2 b$

Step 2.3.4.4.1.1.2

Multiply $- 5$ by $5$ .

$8 = 45 a - 25 a + 5 \cdot - 6 - 3$

$7 = 6 a - 21$

$b = - 5 a - 6$

$c = - 3 - 4 a - 2 b$

Step 2.3.4.4.1.1.3

Multiply $5$ by $- 6$ .

$8 = 45 a - 25 a - 30 - 3$

$7 = 6 a - 21$

$b = - 5 a - 6$

$c = - 3 - 4 a - 2 b$

$8 = 45 a - 25 a - 30 - 3$

$7 = 6 a - 21$

$b = - 5 a - 6$

$c = - 3 - 4 a - 2 b$

Step 2.3.4.4.1.2

Simplify by adding terms.

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Step 2.3.4.4.1.2.1

Subtract $25 a$ from $45 a$ .

$8 = 20 a - 30 - 3$

$7 = 6 a - 21$

$b = - 5 a - 6$

$c = - 3 - 4 a - 2 b$

Step 2.3.4.4.1.2.2

Subtract $3$ from $- 30$ .

$8 = 20 a - 33$

$7 = 6 a - 21$

$b = - 5 a - 6$

$c = - 3 - 4 a - 2 b$

$8 = 20 a - 33$

$7 = 6 a - 21$

$b = - 5 a - 6$

$c = - 3 - 4 a - 2 b$

$8 = 20 a - 33$

$7 = 6 a - 21$

$b = - 5 a - 6$

$c = - 3 - 4 a - 2 b$

$8 = 20 a - 33$

$7 = 6 a - 21$

$b = - 5 a - 6$

$c = - 3 - 4 a - 2 b$

Step 2.3.4.5

Replace all occurrences of $b$ in $c = - 3 - 4 a - 2 b$ with $- 5 a - 6$ .

$c = - 3 - 4 a - 2 (- 5 a - 6)$

$8 = 20 a - 33$

$7 = 6 a - 21$

$b = - 5 a - 6$

Step 2.3.4.6

Simplify the right side.

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Step 2.3.4.6.1

Simplify $- 3 - 4 a - 2 (- 5 a - 6)$ .

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Step 2.3.4.6.1.1

Simplify each term.

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Step 2.3.4.6.1.1.1

Apply the distributive property.

$c = - 3 - 4 a - 2 (- 5 a) - 2 \cdot - 6$

$8 = 20 a - 33$

$7 = 6 a - 21$

$b = - 5 a - 6$

Step 2.3.4.6.1.1.2

Multiply $- 5$ by $- 2$ .

$c = - 3 - 4 a + 10 a - 2 \cdot - 6$

$8 = 20 a - 33$

$7 = 6 a - 21$

$b = - 5 a - 6$

Step 2.3.4.6.1.1.3

Multiply $- 2$ by $- 6$ .

$c = - 3 - 4 a + 10 a + 12$

$8 = 20 a - 33$

$7 = 6 a - 21$

$b = - 5 a - 6$

$c = - 3 - 4 a + 10 a + 12$

$8 = 20 a - 33$

$7 = 6 a - 21$

$b = - 5 a - 6$

Step 2.3.4.6.1.2

Simplify by adding terms.

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Step 2.3.4.6.1.2.1

Add $- 3$ and $12$ .

$c = - 4 a + 10 a + 9$

$8 = 20 a - 33$

$7 = 6 a - 21$

$b = - 5 a - 6$

Step 2.3.4.6.1.2.2

Add $- 4 a$ and $10 a$ .

$c = 6 a + 9$

$8 = 20 a - 33$

$7 = 6 a - 21$

$b = - 5 a - 6$

$c = 6 a + 9$

$8 = 20 a - 33$

$7 = 6 a - 21$

$b = - 5 a - 6$

$c = 6 a + 9$

$8 = 20 a - 33$

$7 = 6 a - 21$

$b = - 5 a - 6$

$c = 6 a + 9$

$8 = 20 a - 33$

$7 = 6 a - 21$

$b = - 5 a - 6$

$c = 6 a + 9$

$8 = 20 a - 33$

$7 = 6 a - 21$

$b = - 5 a - 6$

Step 2.3.5

Solve for $a$ in $8 = 20 a - 33$ .

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Step 2.3.5.1

Rewrite the equation as $20 a - 33 = 8$ .

$20 a - 33 = 8$

$c = 6 a + 9$

$7 = 6 a - 21$

$b = - 5 a - 6$

Step 2.3.5.2

Move all terms not containing $a$ to the right side of the equation.

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Step 2.3.5.2.1

Add $33$ to both sides of the equation.

$20 a = 8 + 33$

$c = 6 a + 9$

$7 = 6 a - 21$

$b = - 5 a - 6$

Step 2.3.5.2.2

Add $8$ and $33$ .

$20 a = 41$

$c = 6 a + 9$

$7 = 6 a - 21$

$b = - 5 a - 6$

$20 a = 41$

$c = 6 a + 9$

$7 = 6 a - 21$

$b = - 5 a - 6$

Step 2.3.5.3

Divide each term in $20 a = 41$ by $20$ and simplify.

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Step 2.3.5.3.1

Divide each term in $20 a = 41$ by $20$ .

$\frac{20 a}{20} = \frac{41}{20}$

$c = 6 a + 9$

$7 = 6 a - 21$

$b = - 5 a - 6$

Step 2.3.5.3.2

Simplify the left side.

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Step 2.3.5.3.2.1

Cancel the common factor of $20$ .

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Step 2.3.5.3.2.1.1

Cancel the common factor.

$\frac{20 a}{20} = \frac{41}{20}$

$c = 6 a + 9$

$7 = 6 a - 21$

$b = - 5 a - 6$

Step 2.3.5.3.2.1.2

Divide $a$ by $1$ .

$a = \frac{41}{20}$

$c = 6 a + 9$

$7 = 6 a - 21$

$b = - 5 a - 6$

$a = \frac{41}{20}$

$c = 6 a + 9$

$7 = 6 a - 21$

$b = - 5 a - 6$

$a = \frac{41}{20}$

$c = 6 a + 9$

$7 = 6 a - 21$

$b = - 5 a - 6$

$a = \frac{41}{20}$

$c = 6 a + 9$

$7 = 6 a - 21$

$b = - 5 a - 6$

$a = \frac{41}{20}$

$c = 6 a + 9$

$7 = 6 a - 21$

$b = - 5 a - 6$

Step 2.3.6

Replace all occurrences of $a$ with $\frac{41}{20}$ in each equation.

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Step 2.3.6.1

Replace all occurrences of $a$ in $c = 6 a + 9$ with $\frac{41}{20}$ .

$c = 6 (\frac{41}{20}) + 9$

$a = \frac{41}{20}$

$7 = 6 a - 21$

$b = - 5 a - 6$

Step 2.3.6.2

Simplify the right side.

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Step 2.3.6.2.1

Simplify $6 (\frac{41}{20}) + 9$ .

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Step 2.3.6.2.1.1

Simplify each term.

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Step 2.3.6.2.1.1.1

Cancel the common factor of $2$ .

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Step 2.3.6.2.1.1.1.1

Factor $2$ out of $6$ .

$c = 2 (3) (\frac{41}{20}) + 9$

$a = \frac{41}{20}$

$7 = 6 a - 21$

$b = - 5 a - 6$

Step 2.3.6.2.1.1.1.2

Factor $2$ out of $20$ .

$c = 2 \cdot (3 (\frac{41}{2 \cdot 10})) + 9$

$a = \frac{41}{20}$

$7 = 6 a - 21$

$b = - 5 a - 6$

Step 2.3.6.2.1.1.1.3

Cancel the common factor.

$c = 2 \cdot (3 (\frac{41}{2 \cdot 10})) + 9$

$a = \frac{41}{20}$

$7 = 6 a - 21$

$b = - 5 a - 6$

Step 2.3.6.2.1.1.1.4

Rewrite the expression.

$c = 3 (\frac{41}{10}) + 9$

$a = \frac{41}{20}$

$7 = 6 a - 21$

$b = - 5 a - 6$

$c = 3 (\frac{41}{10}) + 9$

$a = \frac{41}{20}$

$7 = 6 a - 21$

$b = - 5 a - 6$

Step 2.3.6.2.1.1.2

Combine $3$ and $\frac{41}{10}$ .

$c = \frac{3 \cdot 41}{10} + 9$

$a = \frac{41}{20}$

$7 = 6 a - 21$

$b = - 5 a - 6$

Step 2.3.6.2.1.1.3

Multiply $3$ by $41$ .

$c = \frac{123}{10} + 9$

$a = \frac{41}{20}$

$7 = 6 a - 21$

$b = - 5 a - 6$

$c = \frac{123}{10} + 9$

$a = \frac{41}{20}$

$7 = 6 a - 21$

$b = - 5 a - 6$

Step 2.3.6.2.1.2

To write $9$ as a fraction with a common denominator, multiply by $\frac{10}{10}$ .

$c = \frac{123}{10} + 9 \cdot \frac{10}{10}$

$a = \frac{41}{20}$

$7 = 6 a - 21$

$b = - 5 a - 6$

Step 2.3.6.2.1.3

Combine $9$ and $\frac{10}{10}$ .

$c = \frac{123}{10} + \frac{9 \cdot 10}{10}$

$a = \frac{41}{20}$

$7 = 6 a - 21$

$b = - 5 a - 6$

Step 2.3.6.2.1.4

Combine the numerators over the common denominator.

$c = \frac{123 + 9 \cdot 10}{10}$

$a = \frac{41}{20}$

$7 = 6 a - 21$

$b = - 5 a - 6$

Step 2.3.6.2.1.5

Simplify the numerator.

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Step 2.3.6.2.1.5.1

Multiply $9$ by $10$ .

$c = \frac{123 + 90}{10}$

$a = \frac{41}{20}$

$7 = 6 a - 21$

$b = - 5 a - 6$

Step 2.3.6.2.1.5.2

Add $123$ and $90$ .

$c = \frac{213}{10}$

$a = \frac{41}{20}$

$7 = 6 a - 21$

$b = - 5 a - 6$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

$7 = 6 a - 21$

$b = - 5 a - 6$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

$7 = 6 a - 21$

$b = - 5 a - 6$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

$7 = 6 a - 21$

$b = - 5 a - 6$

Step 2.3.6.3

Replace all occurrences of $a$ in $7 = 6 a - 21$ with $\frac{41}{20}$ .

$7 = 6 (\frac{41}{20}) - 21$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

$b = - 5 a - 6$

Step 2.3.6.4

Simplify the right side.

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Step 2.3.6.4.1

Simplify $6 (\frac{41}{20}) - 21$ .

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Step 2.3.6.4.1.1

Simplify each term.

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Step 2.3.6.4.1.1.1

Cancel the common factor of $2$ .

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Step 2.3.6.4.1.1.1.1

Factor $2$ out of $6$ .

$7 = 2 (3) (\frac{41}{20}) - 21$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

$b = - 5 a - 6$

Step 2.3.6.4.1.1.1.2

Factor $2$ out of $20$ .

$7 = 2 \cdot (3 (\frac{41}{2 \cdot 10})) - 21$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

$b = - 5 a - 6$

Step 2.3.6.4.1.1.1.3

Cancel the common factor.

$7 = 2 \cdot (3 (\frac{41}{2 \cdot 10})) - 21$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

$b = - 5 a - 6$

Step 2.3.6.4.1.1.1.4

Rewrite the expression.

$7 = 3 (\frac{41}{10}) - 21$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

$b = - 5 a - 6$

$7 = 3 (\frac{41}{10}) - 21$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

$b = - 5 a - 6$

Step 2.3.6.4.1.1.2

Combine $3$ and $\frac{41}{10}$ .

$7 = \frac{3 \cdot 41}{10} - 21$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

$b = - 5 a - 6$

Step 2.3.6.4.1.1.3

Multiply $3$ by $41$ .

$7 = \frac{123}{10} - 21$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

$b = - 5 a - 6$

$7 = \frac{123}{10} - 21$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

$b = - 5 a - 6$

Step 2.3.6.4.1.2

To write $- 21$ as a fraction with a common denominator, multiply by $\frac{10}{10}$ .

$7 = \frac{123}{10} - 21 \cdot \frac{10}{10}$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

$b = - 5 a - 6$

Step 2.3.6.4.1.3

Combine $- 21$ and $\frac{10}{10}$ .

$7 = \frac{123}{10} + \frac{- 21 \cdot 10}{10}$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

$b = - 5 a - 6$

Step 2.3.6.4.1.4

Combine the numerators over the common denominator.

$7 = \frac{123 - 21 \cdot 10}{10}$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

$b = - 5 a - 6$

Step 2.3.6.4.1.5

Simplify the numerator.

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Step 2.3.6.4.1.5.1

Multiply $- 21$ by $10$ .

$7 = \frac{123 - 210}{10}$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

$b = - 5 a - 6$

Step 2.3.6.4.1.5.2

Subtract $210$ from $123$ .

$7 = \frac{- 87}{10}$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

$b = - 5 a - 6$

$7 = \frac{- 87}{10}$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

$b = - 5 a - 6$

Step 2.3.6.4.1.6

Move the negative in front of the fraction.

$7 = - \frac{87}{10}$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

$b = - 5 a - 6$

$7 = - \frac{87}{10}$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

$b = - 5 a - 6$

$7 = - \frac{87}{10}$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

$b = - 5 a - 6$

Step 2.3.6.5

Replace all occurrences of $a$ in $b = - 5 a - 6$ with $\frac{41}{20}$ .

$b = - 5 (\frac{41}{20}) - 6$

$7 = - \frac{87}{10}$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

Step 2.3.6.6

Simplify the right side.

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Step 2.3.6.6.1

Simplify $- 5 (\frac{41}{20}) - 6$ .

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Step 2.3.6.6.1.1

Simplify each term.

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Step 2.3.6.6.1.1.1

Cancel the common factor of $5$ .

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Step 2.3.6.6.1.1.1.1

Factor $5$ out of $- 5$ .

$b = 5 (- 1) (\frac{41}{20}) - 6$

$7 = - \frac{87}{10}$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

Step 2.3.6.6.1.1.1.2

Factor $5$ out of $20$ .

$b = 5 \cdot (- 1 \frac{41}{5 \cdot 4}) - 6$

$7 = - \frac{87}{10}$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

Step 2.3.6.6.1.1.1.3

Cancel the common factor.

$b = 5 \cdot (- 1 \frac{41}{5 \cdot 4}) - 6$

$7 = - \frac{87}{10}$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

Step 2.3.6.6.1.1.1.4

Rewrite the expression.

$b = - 1 (\frac{41}{4}) - 6$

$7 = - \frac{87}{10}$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

$b = - 1 (\frac{41}{4}) - 6$

$7 = - \frac{87}{10}$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

Step 2.3.6.6.1.1.2

Rewrite $- 1 (\frac{41}{4})$ as $- (\frac{41}{4})$ .

$b = - \frac{41}{4} - 6$

$7 = - \frac{87}{10}$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

$b = - \frac{41}{4} - 6$

$7 = - \frac{87}{10}$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

Step 2.3.6.6.1.2

To write $- 6$ as a fraction with a common denominator, multiply by $\frac{4}{4}$ .

$b = - \frac{41}{4} - 6 \cdot \frac{4}{4}$

$7 = - \frac{87}{10}$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

Step 2.3.6.6.1.3

Combine $- 6$ and $\frac{4}{4}$ .

$b = - \frac{41}{4} + \frac{- 6 \cdot 4}{4}$

$7 = - \frac{87}{10}$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

Step 2.3.6.6.1.4

Combine the numerators over the common denominator.

$b = \frac{- 41 - 6 \cdot 4}{4}$

$7 = - \frac{87}{10}$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

Step 2.3.6.6.1.5

Simplify the numerator.

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Step 2.3.6.6.1.5.1

Multiply $- 6$ by $4$ .

$b = \frac{- 41 - 24}{4}$

$7 = - \frac{87}{10}$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

Step 2.3.6.6.1.5.2

Subtract $24$ from $- 41$ .

$b = \frac{- 65}{4}$

$7 = - \frac{87}{10}$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

$b = \frac{- 65}{4}$

$7 = - \frac{87}{10}$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

Step 2.3.6.6.1.6

Move the negative in front of the fraction.

$b = - \frac{65}{4}$

$7 = - \frac{87}{10}$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

$b = - \frac{65}{4}$

$7 = - \frac{87}{10}$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

$b = - \frac{65}{4}$

$7 = - \frac{87}{10}$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

$b = - \frac{65}{4}$

$7 = - \frac{87}{10}$

$c = \frac{213}{10}$

$a = \frac{41}{20}$

Step 2.3.7

Since $7 = - \frac{87}{10}$ is not true, there is no solution.

No solution

Step 2.4

Calculate the value of $y$ using each $x$ value in the table and compare this value to the given $y$ value in the table.

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Step 2.4.1

Calculate the value of $y$ such that $y = a x^{2} + b$ when $a = 0$ , $b = 0$ , $c = 0$ , and $x = 2$ .

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Step 2.4.1.1

Simplify each term.

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Step 2.4.1.1.1

Raise $2$ to the power of $2$ .

$y = 0 \cdot 4 + (0) \cdot (2) + 0$

Step 2.4.1.1.2

Multiply $0$ by $4$ .

$y = 0 + (0) \cdot (2) + 0$

Step 2.4.1.1.3

Multiply $0$ by $2$ .

$y = 0 + 0 + 0$

Step 2.4.1.2

Simplify by adding numbers.

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Step 2.4.1.2.1

Add $0$ and $0$ .

$y = 0 + 0$

Step 2.4.1.2.2

Add $0$ and $0$ .

$y = 0$

Step 2.4.2

If the table has a quadratic function rule, $y = y$ for the corresponding $x$ value, $x = 2$ . This check does not pass, since $y = 0$ and $y = - 3$ . The function rule can't be quadratic.

$0 \neq - 3$

Step 2.4.3

Since $y \neq y$ for the corresponding $x$ values, the function is not quadratic.

The function is not quadratic

Step 3

Check if the function rule is cubic.

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Step 3.1

To find if the table follows a function rule, check whether the function rule could follow the form $y = a x^{3} + b x^{2} + c x + d$ .

$y = a x^{3} + b x^{2} + c x + d$

Step 3.2

Build a set of $4$ equations from the table such that $y = a x^{3} + b x^{2} + c x + d$ .

Step 3.3

Calculate the values of $a$ , $b$ , $c$ , and $d$ .

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Step 3.3.1

Solve for $d$ in $- 3 = a \cdot 2^{3} + b \cdot 2^{2} + c (2) + d$ .

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Step 3.3.1.1

Rewrite the equation as $a \cdot 2^{3} + b \cdot 2^{2} + c (2) + d = - 3$ .

$a \cdot 2^{3} + b \cdot 2^{2} + c (2) + d = - 3$

$8 = a \cdot 7^{3} + b \cdot 2^{2} + c (2) + d$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.1.2

Simplify each term.

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Step 3.3.1.2.1

Raise $2$ to the power of $3$ .

$a \cdot 8 + b \cdot 2^{2} + c (2) + d = - 3$

$8 = a \cdot 7^{3} + b \cdot 2^{2} + c (2) + d$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.1.2.2

Move $8$ to the left of $a$ .

$8 \cdot a + b \cdot 2^{2} + c (2) + d = - 3$

$8 = a \cdot 7^{3} + b \cdot 2^{2} + c (2) + d$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.1.2.3

Raise $2$ to the power of $2$ .

$8 a + b \cdot 4 + c (2) + d = - 3$

$8 = a \cdot 7^{3} + b \cdot 2^{2} + c (2) + d$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.1.2.4

Move $4$ to the left of $b$ .

$8 a + 4 \cdot b + c (2) + d = - 3$

$8 = a \cdot 7^{3} + b \cdot 2^{2} + c (2) + d$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.1.2.5

Move $2$ to the left of $c$ .

$8 a + 4 b + 2 c + d = - 3$

$8 = a \cdot 7^{3} + b \cdot 2^{2} + c (2) + d$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

$8 a + 4 b + 2 c + d = - 3$

$8 = a \cdot 7^{3} + b \cdot 2^{2} + c (2) + d$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.1.3

Move all terms not containing $d$ to the right side of the equation.

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Step 3.3.1.3.1

Subtract $8 a$ from both sides of the equation.

$4 b + 2 c + d = - 3 - 8 a$

$8 = a \cdot 7^{3} + b \cdot 2^{2} + c (2) + d$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.1.3.2

Subtract $4 b$ from both sides of the equation.

$2 c + d = - 3 - 8 a - 4 b$

$8 = a \cdot 7^{3} + b \cdot 2^{2} + c (2) + d$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.1.3.3

Subtract $2 c$ from both sides of the equation.

$d = - 3 - 8 a - 4 b - 2 c$

$8 = a \cdot 7^{3} + b \cdot 2^{2} + c (2) + d$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

$d = - 3 - 8 a - 4 b - 2 c$

$8 = a \cdot 7^{3} + b \cdot 2^{2} + c (2) + d$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

$d = - 3 - 8 a - 4 b - 2 c$

$8 = a \cdot 7^{3} + b \cdot 2^{2} + c (2) + d$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.2

Replace all occurrences of $d$ with $- 3 - 8 a - 4 b - 2 c$ in each equation.

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Step 3.3.2.1

Replace all occurrences of $d$ in $8 = a \cdot 7^{3} + b \cdot 2^{2} + c (2) + d$ with $- 3 - 8 a - 4 b - 2 c$ .

$8 = a \cdot 7^{3} + b \cdot 2^{2} + c (2) - 3 - 8 a - 4 b - 2 c$

$d = - 3 - 8 a - 4 b - 2 c$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.2.2

Simplify $8 = a \cdot 7^{3} + b \cdot 2^{2} + c (2) - 3 - 8 a - 4 b - 2 c$ .

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Step 3.3.2.2.1

Simplify the left side.

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Step 3.3.2.2.1.1

Remove parentheses.

$8 = a \cdot 7^{3} + b \cdot 2^{2} + c (2) - 3 - 8 a - 4 b - 2 c$

$d = - 3 - 8 a - 4 b - 2 c$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

$8 = a \cdot 7^{3} + b \cdot 2^{2} + c (2) - 3 - 8 a - 4 b - 2 c$

$d = - 3 - 8 a - 4 b - 2 c$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.2.2.2

Simplify the right side.

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Step 3.3.2.2.2.1

Simplify $a \cdot 7^{3} + b \cdot 2^{2} + c (2) - 3 - 8 a - 4 b - 2 c$ .

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Step 3.3.2.2.2.1.1

Combine the opposite terms in $a \cdot 7^{3} + b \cdot 2^{2} + c (2) - 3 - 8 a - 4 b - 2 c$ .

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Step 3.3.2.2.2.1.1.1

Reorder the factors in the terms $c (2)$ and $- 2 c$ .

$8 = a \cdot 7^{3} + b \cdot 2^{2} + 2 c - 3 - 8 a - 4 b - 2 c$

$d = - 3 - 8 a - 4 b - 2 c$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.2.2.2.1.1.2

Subtract $2 c$ from $2 c$ .

$8 = a \cdot 7^{3} + b \cdot 2^{2} - 3 - 8 a - 4 b + 0$

$d = - 3 - 8 a - 4 b - 2 c$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.2.2.2.1.1.3

Add $a \cdot 7^{3} + b \cdot 2^{2} - 3 - 8 a - 4 b$ and $0$ .

$8 = a \cdot 7^{3} + b \cdot 2^{2} - 3 - 8 a - 4 b$

$d = - 3 - 8 a - 4 b - 2 c$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

$8 = a \cdot 7^{3} + b \cdot 2^{2} - 3 - 8 a - 4 b$

$d = - 3 - 8 a - 4 b - 2 c$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.2.2.2.1.2

Simplify each term.

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Step 3.3.2.2.2.1.2.1

Raise $7$ to the power of $3$ .

$8 = a \cdot 343 + b \cdot 2^{2} - 3 - 8 a - 4 b$

$d = - 3 - 8 a - 4 b - 2 c$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.2.2.2.1.2.2

Move $343$ to the left of $a$ .

$8 = 343 \cdot a + b \cdot 2^{2} - 3 - 8 a - 4 b$

$d = - 3 - 8 a - 4 b - 2 c$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.2.2.2.1.2.3

Raise $2$ to the power of $2$ .

$8 = 343 a + b \cdot 4 - 3 - 8 a - 4 b$

$d = - 3 - 8 a - 4 b - 2 c$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.2.2.2.1.2.4

Move $4$ to the left of $b$ .

$8 = 343 a + 4 b - 3 - 8 a - 4 b$

$d = - 3 - 8 a - 4 b - 2 c$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

$8 = 343 a + 4 b - 3 - 8 a - 4 b$

$d = - 3 - 8 a - 4 b - 2 c$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.2.2.2.1.3

Simplify by adding terms.

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Step 3.3.2.2.2.1.3.1

Combine the opposite terms in $343 a + 4 b - 3 - 8 a - 4 b$ .

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Step 3.3.2.2.2.1.3.1.1

Subtract $4 b$ from $4 b$ .

$8 = 343 a - 3 - 8 a + 0$

$d = - 3 - 8 a - 4 b - 2 c$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.2.2.2.1.3.1.2

Add $343 a - 3 - 8 a$ and $0$ .

$8 = 343 a - 3 - 8 a$

$d = - 3 - 8 a - 4 b - 2 c$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

$8 = 343 a - 3 - 8 a$

$d = - 3 - 8 a - 4 b - 2 c$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.2.2.2.1.3.2

Subtract $8 a$ from $343 a$ .

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.2.3

Replace all occurrences of $d$ in $7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) + d$ with $- 3 - 8 a - 4 b - 2 c$ .

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) - 3 - 8 a - 4 b - 2 c$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.2.4

Simplify $7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) - 3 - 8 a - 4 b - 2 c$ .

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Step 3.3.2.4.1

Simplify the left side.

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Step 3.3.2.4.1.1

Remove parentheses.

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) - 3 - 8 a - 4 b - 2 c$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

$7 = a \cdot 5^{3} + b \cdot 2^{2} + c (2) - 3 - 8 a - 4 b - 2 c$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.2.4.2

Simplify the right side.

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Step 3.3.2.4.2.1

Simplify $a \cdot 5^{3} + b \cdot 2^{2} + c (2) - 3 - 8 a - 4 b - 2 c$ .

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Step 3.3.2.4.2.1.1

Combine the opposite terms in $a \cdot 5^{3} + b \cdot 2^{2} + c (2) - 3 - 8 a - 4 b - 2 c$ .

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Step 3.3.2.4.2.1.1.1

Reorder the factors in the terms $c (2)$ and $- 2 c$ .

$7 = a \cdot 5^{3} + b \cdot 2^{2} + 2 c - 3 - 8 a - 4 b - 2 c$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.2.4.2.1.1.2

Subtract $2 c$ from $2 c$ .

$7 = a \cdot 5^{3} + b \cdot 2^{2} - 3 - 8 a - 4 b + 0$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.2.4.2.1.1.3

Add $a \cdot 5^{3} + b \cdot 2^{2} - 3 - 8 a - 4 b$ and $0$ .

$7 = a \cdot 5^{3} + b \cdot 2^{2} - 3 - 8 a - 4 b$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

$7 = a \cdot 5^{3} + b \cdot 2^{2} - 3 - 8 a - 4 b$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.2.4.2.1.2

Simplify each term.

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Step 3.3.2.4.2.1.2.1

Raise $5$ to the power of $3$ .

$7 = a \cdot 125 + b \cdot 2^{2} - 3 - 8 a - 4 b$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.2.4.2.1.2.2

Move $125$ to the left of $a$ .

$7 = 125 \cdot a + b \cdot 2^{2} - 3 - 8 a - 4 b$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.2.4.2.1.2.3

Raise $2$ to the power of $2$ .

$7 = 125 a + b \cdot 4 - 3 - 8 a - 4 b$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.2.4.2.1.2.4

Move $4$ to the left of $b$ .

$7 = 125 a + 4 b - 3 - 8 a - 4 b$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

$7 = 125 a + 4 b - 3 - 8 a - 4 b$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.2.4.2.1.3

Simplify by adding terms.

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Step 3.3.2.4.2.1.3.1

Combine the opposite terms in $125 a + 4 b - 3 - 8 a - 4 b$ .

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Step 3.3.2.4.2.1.3.1.1

Subtract $4 b$ from $4 b$ .

$7 = 125 a - 3 - 8 a + 0$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.2.4.2.1.3.1.2

Add $125 a - 3 - 8 a$ and $0$ .

$7 = 125 a - 3 - 8 a$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

$7 = 125 a - 3 - 8 a$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.2.4.2.1.3.2

Subtract $8 a$ from $125 a$ .

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$

Step 3.3.2.5

Replace all occurrences of $d$ in $- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) + d$ with $- 3 - 8 a - 4 b - 2 c$ .

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) - 3 - 8 a - 4 b - 2 c$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.2.6

Simplify $- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) - 3 - 8 a - 4 b - 2 c$ .

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Step 3.3.2.6.1

Simplify the left side.

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Step 3.3.2.6.1.1

Remove parentheses.

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) - 3 - 8 a - 4 b - 2 c$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + c (2) - 3 - 8 a - 4 b - 2 c$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.2.6.2

Simplify the right side.

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Step 3.3.2.6.2.1

Simplify $a \cdot 3^{3} + b \cdot 2^{2} + c (2) - 3 - 8 a - 4 b - 2 c$ .

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Step 3.3.2.6.2.1.1

Combine the opposite terms in $a \cdot 3^{3} + b \cdot 2^{2} + c (2) - 3 - 8 a - 4 b - 2 c$ .

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Step 3.3.2.6.2.1.1.1

Reorder the factors in the terms $c (2)$ and $- 2 c$ .

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} + 2 c - 3 - 8 a - 4 b - 2 c$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.2.6.2.1.1.2

Subtract $2 c$ from $2 c$ .

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} - 3 - 8 a - 4 b + 0$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.2.6.2.1.1.3

Add $a \cdot 3^{3} + b \cdot 2^{2} - 3 - 8 a - 4 b$ and $0$ .

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} - 3 - 8 a - 4 b$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$- 9 = a \cdot 3^{3} + b \cdot 2^{2} - 3 - 8 a - 4 b$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.2.6.2.1.2

Simplify each term.

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Step 3.3.2.6.2.1.2.1

Raise $3$ to the power of $3$ .

$- 9 = a \cdot 27 + b \cdot 2^{2} - 3 - 8 a - 4 b$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.2.6.2.1.2.2

Move $27$ to the left of $a$ .

$- 9 = 27 \cdot a + b \cdot 2^{2} - 3 - 8 a - 4 b$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.2.6.2.1.2.3

Raise $2$ to the power of $2$ .

$- 9 = 27 a + b \cdot 4 - 3 - 8 a - 4 b$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.2.6.2.1.2.4

Move $4$ to the left of $b$ .

$- 9 = 27 a + 4 b - 3 - 8 a - 4 b$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$- 9 = 27 a + 4 b - 3 - 8 a - 4 b$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.2.6.2.1.3

Simplify by adding terms.

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Step 3.3.2.6.2.1.3.1

Combine the opposite terms in $27 a + 4 b - 3 - 8 a - 4 b$ .

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Step 3.3.2.6.2.1.3.1.1

Subtract $4 b$ from $4 b$ .

$- 9 = 27 a - 3 - 8 a + 0$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.2.6.2.1.3.1.2

Add $27 a - 3 - 8 a$ and $0$ .

$- 9 = 27 a - 3 - 8 a$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$- 9 = 27 a - 3 - 8 a$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.2.6.2.1.3.2

Subtract $8 a$ from $27 a$ .

$- 9 = 19 a - 3$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$- 9 = 19 a - 3$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$- 9 = 19 a - 3$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$- 9 = 19 a - 3$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$- 9 = 19 a - 3$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$- 9 = 19 a - 3$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.3

Solve for $a$ in $- 9 = 19 a - 3$ .

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Step 3.3.3.1

Rewrite the equation as $19 a - 3 = - 9$ .

$19 a - 3 = - 9$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.3.2

Move all terms not containing $a$ to the right side of the equation.

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Step 3.3.3.2.1

Add $3$ to both sides of the equation.

$19 a = - 9 + 3$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.3.2.2

Add $- 9$ and $3$ .

$19 a = - 6$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$19 a = - 6$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.3.3

Divide each term in $19 a = - 6$ by $19$ and simplify.

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Step 3.3.3.3.1

Divide each term in $19 a = - 6$ by $19$ .

$\frac{19 a}{19} = \frac{- 6}{19}$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.3.3.2

Simplify the left side.

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Step 3.3.3.3.2.1

Cancel the common factor of $19$ .

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Step 3.3.3.3.2.1.1

Cancel the common factor.

$\frac{19 a}{19} = \frac{- 6}{19}$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.3.3.2.1.2

Divide $a$ by $1$ .

$a = \frac{- 6}{19}$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$a = \frac{- 6}{19}$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$a = \frac{- 6}{19}$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.3.3.3

Simplify the right side.

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Step 3.3.3.3.3.1

Move the negative in front of the fraction.

$a = - \frac{6}{19}$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$a = - \frac{6}{19}$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$a = - \frac{6}{19}$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$a = - \frac{6}{19}$

$7 = 117 a - 3$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.4

Replace all occurrences of $a$ with $- \frac{6}{19}$ in each equation.

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Step 3.3.4.1

Replace all occurrences of $a$ in $7 = 117 a - 3$ with $- \frac{6}{19}$ .

$7 = 117 (- \frac{6}{19}) - 3$

$a = - \frac{6}{19}$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.4.2

Simplify the right side.

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Step 3.3.4.2.1

Simplify $117 (- \frac{6}{19}) - 3$ .

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Step 3.3.4.2.1.1

Simplify each term.

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Step 3.3.4.2.1.1.1

Multiply $117 (- \frac{6}{19})$ .

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Step 3.3.4.2.1.1.1.1

Multiply $- 1$ by $117$ .

$7 = - 117 (\frac{6}{19}) - 3$

$a = - \frac{6}{19}$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.4.2.1.1.1.2

Combine $- 117$ and $\frac{6}{19}$ .

$7 = \frac{- 117 \cdot 6}{19} - 3$

$a = - \frac{6}{19}$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.4.2.1.1.1.3

Multiply $- 117$ by $6$ .

$7 = \frac{- 702}{19} - 3$

$a = - \frac{6}{19}$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$7 = \frac{- 702}{19} - 3$

$a = - \frac{6}{19}$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.4.2.1.1.2

Move the negative in front of the fraction.

$7 = - \frac{702}{19} - 3$

$a = - \frac{6}{19}$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$7 = - \frac{702}{19} - 3$

$a = - \frac{6}{19}$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.4.2.1.2

To write $- 3$ as a fraction with a common denominator, multiply by $\frac{19}{19}$ .

$7 = - \frac{702}{19} - 3 \cdot \frac{19}{19}$

$a = - \frac{6}{19}$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.4.2.1.3

Combine $- 3$ and $\frac{19}{19}$ .

$7 = - \frac{702}{19} + \frac{- 3 \cdot 19}{19}$

$a = - \frac{6}{19}$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.4.2.1.4

Combine the numerators over the common denominator.

$7 = \frac{- 702 - 3 \cdot 19}{19}$

$a = - \frac{6}{19}$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.4.2.1.5

Simplify the numerator.

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Step 3.3.4.2.1.5.1

Multiply $- 3$ by $19$ .

$7 = \frac{- 702 - 57}{19}$

$a = - \frac{6}{19}$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.4.2.1.5.2

Subtract $57$ from $- 702$ .

$7 = \frac{- 759}{19}$

$a = - \frac{6}{19}$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$7 = \frac{- 759}{19}$

$a = - \frac{6}{19}$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.4.2.1.6

Move the negative in front of the fraction.

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

$8 = 335 a - 3$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.4.3

Replace all occurrences of $a$ in $8 = 335 a - 3$ with $- \frac{6}{19}$ .

$8 = 335 (- \frac{6}{19}) - 3$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.4.4

Simplify the right side.

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Step 3.3.4.4.1

Simplify $335 (- \frac{6}{19}) - 3$ .

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Step 3.3.4.4.1.1

Simplify each term.

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Step 3.3.4.4.1.1.1

Multiply $335 (- \frac{6}{19})$ .

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Step 3.3.4.4.1.1.1.1

Multiply $- 1$ by $335$ .

$8 = - 335 (\frac{6}{19}) - 3$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.4.4.1.1.1.2

Combine $- 335$ and $\frac{6}{19}$ .

$8 = \frac{- 335 \cdot 6}{19} - 3$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.4.4.1.1.1.3

Multiply $- 335$ by $6$ .

$8 = \frac{- 2010}{19} - 3$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

$d = - 3 - 8 a - 4 b - 2 c$

$8 = \frac{- 2010}{19} - 3$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.4.4.1.1.2

Move the negative in front of the fraction.

$8 = - \frac{2010}{19} - 3$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

$d = - 3 - 8 a - 4 b - 2 c$

$8 = - \frac{2010}{19} - 3$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.4.4.1.2

To write $- 3$ as a fraction with a common denominator, multiply by $\frac{19}{19}$ .

$8 = - \frac{2010}{19} - 3 \cdot \frac{19}{19}$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.4.4.1.3

Combine $- 3$ and $\frac{19}{19}$ .

$8 = - \frac{2010}{19} + \frac{- 3 \cdot 19}{19}$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.4.4.1.4

Combine the numerators over the common denominator.

$8 = \frac{- 2010 - 3 \cdot 19}{19}$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.4.4.1.5

Simplify the numerator.

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Step 3.3.4.4.1.5.1

Multiply $- 3$ by $19$ .

$8 = \frac{- 2010 - 57}{19}$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.4.4.1.5.2

Subtract $57$ from $- 2010$ .

$8 = \frac{- 2067}{19}$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

$d = - 3 - 8 a - 4 b - 2 c$

$8 = \frac{- 2067}{19}$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.4.4.1.6

Move the negative in front of the fraction.

$8 = - \frac{2067}{19}$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

$d = - 3 - 8 a - 4 b - 2 c$

$8 = - \frac{2067}{19}$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

$d = - 3 - 8 a - 4 b - 2 c$

$8 = - \frac{2067}{19}$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

$d = - 3 - 8 a - 4 b - 2 c$

Step 3.3.4.5

Replace all occurrences of $a$ in $d = - 3 - 8 a - 4 b - 2 c$ with $- \frac{6}{19}$ .

$d = - 3 - 8 (- \frac{6}{19}) - 4 b - 2 c$

$8 = - \frac{2067}{19}$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

Step 3.3.4.6

Simplify the right side.

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Step 3.3.4.6.1

Simplify $- 3 - 8 (- \frac{6}{19}) - 4 b - 2 c$ .

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Step 3.3.4.6.1.1

Multiply $- 8 (- \frac{6}{19})$ .

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Step 3.3.4.6.1.1.1

Multiply $- 1$ by $- 8$ .

$d = - 3 + 8 (\frac{6}{19}) - 4 b - 2 c$

$8 = - \frac{2067}{19}$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

Step 3.3.4.6.1.1.2

Combine $8$ and $\frac{6}{19}$ .

$d = - 3 + \frac{8 \cdot 6}{19} - 4 b - 2 c$

$8 = - \frac{2067}{19}$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

Step 3.3.4.6.1.1.3

Multiply $8$ by $6$ .

$d = - 3 + \frac{48}{19} - 4 b - 2 c$

$8 = - \frac{2067}{19}$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

$d = - 3 + \frac{48}{19} - 4 b - 2 c$

$8 = - \frac{2067}{19}$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

Step 3.3.4.6.1.2

To write $- 3$ as a fraction with a common denominator, multiply by $\frac{19}{19}$ .

$d = - 3 \cdot \frac{19}{19} + \frac{48}{19} - 4 b - 2 c$

$8 = - \frac{2067}{19}$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

Step 3.3.4.6.1.3

Combine $- 3$ and $\frac{19}{19}$ .

$d = \frac{- 3 \cdot 19}{19} + \frac{48}{19} - 4 b - 2 c$

$8 = - \frac{2067}{19}$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

Step 3.3.4.6.1.4

Combine the numerators over the common denominator.

$d = \frac{- 3 \cdot 19 + 48}{19} - 4 b - 2 c$

$8 = - \frac{2067}{19}$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

Step 3.3.4.6.1.5

Simplify the numerator.

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Step 3.3.4.6.1.5.1

Multiply $- 3$ by $19$ .

$d = \frac{- 57 + 48}{19} - 4 b - 2 c$

$8 = - \frac{2067}{19}$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

Step 3.3.4.6.1.5.2

Add $- 57$ and $48$ .

$d = \frac{- 9}{19} - 4 b - 2 c$

$8 = - \frac{2067}{19}$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

$d = \frac{- 9}{19} - 4 b - 2 c$

$8 = - \frac{2067}{19}$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

Step 3.3.4.6.1.6

Move the negative in front of the fraction.

$d = - \frac{9}{19} - 4 b - 2 c$

$8 = - \frac{2067}{19}$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

$d = - \frac{9}{19} - 4 b - 2 c$

$8 = - \frac{2067}{19}$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

$d = - \frac{9}{19} - 4 b - 2 c$

$8 = - \frac{2067}{19}$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

$d = - \frac{9}{19} - 4 b - 2 c$

$8 = - \frac{2067}{19}$

$7 = - \frac{759}{19}$

$a = - \frac{6}{19}$

Step 3.3.5

Since $8 = - \frac{2067}{19}$ is not true, there is no solution.

No solution

Step 3.4

Calculate the value of $y$ using each $x$ value in the table and compare this value to the given $y$ value in the table.

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Step 3.4.1

Calculate the value of $y$ such that $y = a x^{3} + b$ when $a = 0$ , $b = 0$ , $c = 0$ , $d = 0$ , and $x = 2$ .

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Step 3.4.1.1

Simplify each term.

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Step 3.4.1.1.1

Raise $2$ to the power of $3$ .

$y = 0 \cdot 8 + (0) \cdot (2^{2}) + (0) \cdot ((2) \cdot 0)$

Step 3.4.1.1.2

Multiply $0$ by $8$ .

$y = 0 + (0) \cdot (2^{2}) + (0) \cdot ((2) \cdot 0)$

Step 3.4.1.1.3

Raise $2$ to the power of $2$ .

$y = 0 + 0 \cdot 4 + (0) \cdot ((2) \cdot 0)$

Step 3.4.1.1.4

Multiply $0$ by $4$ .

$y = 0 + 0 + (0) \cdot ((2) \cdot 0)$

Step 3.4.1.1.5

Multiply $(0) ((2) \cdot 0)$ .

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Step 3.4.1.1.5.1

Multiply $2$ by $0$ .

$y = 0 + 0 + 0 \cdot 0$

Step 3.4.1.1.5.2

Multiply $0$ by $0$ .

$y = 0 + 0 + 0$

Step 3.4.1.2

Simplify by adding numbers.

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Step 3.4.1.2.1

Add $0$ and $0$ .

$y = 0 + 0$

Step 3.4.1.2.2

Add $0$ and $0$ .

$y = 0$

Step 3.4.2

If the table has a cubic function rule, $y = y$ for the corresponding $x$ value, $x = 2$ . This check does not pass, since $y = 0$ and $y = - 3$ . The function rule can't be cubic.

$0 \neq - 3$

Step 3.4.3

Since $y \neq y$ for the corresponding $x$ values, the function is not cubic.

The function is not cubic

Step 4

There are no values for $a$ , $b$ , $c$ , and $d$ in the equations $y = a x + b$ , $y = a x^{2} + b x + c$ , and $y = a x^{3} + b x^{2} + c x + d$ that work for every pair of $x$ and $y$ .

The table does not have a function rule that is linear, quadratic, or cubic.