Linear Algebra Examples

$[\begin{array}{c} - 4 & - 5 & 5 \\ 1 & 4 & - 2 \\ 6 & 1 & - 6 \end{array}] [\begin{array}{c} x \\ y \\ z \end{array}] = [\begin{array}{c} - 11 \\ 3 \\ 17 \end{array}]$

Step 1

Multiply $[\begin{array}{c} - 4 & - 5 & 5 \\ 1 & 4 & - 2 \\ 6 & 1 & - 6 \end{array}] [\begin{array}{c} x \\ y \\ z \end{array}]$ .

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Step 1.1

Two matrices can be multiplied if and only if the number of columns in the first matrix is equal to the number of rows in the second matrix. In this case, the first matrix is $3 \times 3$ and the second matrix is $3 \times 1$ .

Step 1.2

Multiply each row in the first matrix by each column in the second matrix.

$[\begin{array}{c} - 4 x - 5 y + 5 z \\ 1 x + 4 y - 2 z \\ 6 x + 1 y - 6 z \end{array}] = [\begin{array}{c} - 11 \\ 3 \\ 17 \end{array}]$

Step 1.3

Simplify each element of the matrix by multiplying out all the expressions.

$[\begin{array}{c} - 4 x - 5 y + 5 z \\ x + 4 y - 2 z \\ 6 x + y - 6 z \end{array}] = [\begin{array}{c} - 11 \\ 3 \\ 17 \end{array}]$

Step 2

Write as a linear system of equations.

$- 4 x - 5 y + 5 z = - 11$

$x + 4 y - 2 z = 3$

$6 x + y - 6 z = 17$

Step 3

Solve the system of equations.

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Step 3.1

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

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Step 3.1.1

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

$x - 2 z = 3 - 4 y$

$- 4 x - 5 y + 5 z = - 11$

$6 x + y - 6 z = 17$

Step 3.1.2

Add $2 z$ to both sides of the equation.

$x = 3 - 4 y + 2 z$

$- 4 x - 5 y + 5 z = - 11$

$6 x + y - 6 z = 17$

$x = 3 - 4 y + 2 z$

$- 4 x - 5 y + 5 z = - 11$

$6 x + y - 6 z = 17$

Step 3.2

Replace all occurrences of $x$ with $3 - 4 y + 2 z$ in each equation.

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Step 3.2.1

Replace all occurrences of $x$ in $- 4 x - 5 y + 5 z = - 11$ with $3 - 4 y + 2 z$ .

$- 4 (3 - 4 y + 2 z) - 5 y + 5 z = - 11$

$x = 3 - 4 y + 2 z$

$6 x + y - 6 z = 17$

Step 3.2.2

Simplify the left side.

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Step 3.2.2.1

Simplify $- 4 (3 - 4 y + 2 z) - 5 y + 5 z$ .

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Step 3.2.2.1.1

Simplify each term.

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Step 3.2.2.1.1.1

Apply the distributive property.

$- 4 \cdot 3 - 4 (- 4 y) - 4 (2 z) - 5 y + 5 z = - 11$

$x = 3 - 4 y + 2 z$

$6 x + y - 6 z = 17$

Step 3.2.2.1.1.2

Simplify.

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Step 3.2.2.1.1.2.1

Multiply $- 4$ by $3$ .

$- 12 - 4 (- 4 y) - 4 (2 z) - 5 y + 5 z = - 11$

$x = 3 - 4 y + 2 z$

$6 x + y - 6 z = 17$

Step 3.2.2.1.1.2.2

Multiply $- 4$ by $- 4$ .

$- 12 + 16 y - 4 (2 z) - 5 y + 5 z = - 11$

$x = 3 - 4 y + 2 z$

$6 x + y - 6 z = 17$

Step 3.2.2.1.1.2.3

Multiply $2$ by $- 4$ .

$- 12 + 16 y - 8 z - 5 y + 5 z = - 11$

$x = 3 - 4 y + 2 z$

$6 x + y - 6 z = 17$

$- 12 + 16 y - 8 z - 5 y + 5 z = - 11$

$x = 3 - 4 y + 2 z$

$6 x + y - 6 z = 17$

$- 12 + 16 y - 8 z - 5 y + 5 z = - 11$

$x = 3 - 4 y + 2 z$

$6 x + y - 6 z = 17$

Step 3.2.2.1.2

Simplify by adding terms.

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Step 3.2.2.1.2.1

Subtract $5 y$ from $16 y$ .

$- 12 + 11 y - 8 z + 5 z = - 11$

$x = 3 - 4 y + 2 z$

$6 x + y - 6 z = 17$

Step 3.2.2.1.2.2

Add $- 8 z$ and $5 z$ .

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

$6 x + y - 6 z = 17$

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

$6 x + y - 6 z = 17$

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

$6 x + y - 6 z = 17$

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

$6 x + y - 6 z = 17$

Step 3.2.3

Replace all occurrences of $x$ in $6 x + y - 6 z = 17$ with $3 - 4 y + 2 z$ .

$6 (3 - 4 y + 2 z) + y - 6 z = 17$

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

Step 3.2.4

Simplify the left side.

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Step 3.2.4.1

Simplify $6 (3 - 4 y + 2 z) + y - 6 z$ .

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Step 3.2.4.1.1

Simplify each term.

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Step 3.2.4.1.1.1

Apply the distributive property.

$6 \cdot 3 + 6 (- 4 y) + 6 (2 z) + y - 6 z = 17$

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

Step 3.2.4.1.1.2

Simplify.

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Step 3.2.4.1.1.2.1

Multiply $6$ by $3$ .

$18 + 6 (- 4 y) + 6 (2 z) + y - 6 z = 17$

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

Step 3.2.4.1.1.2.2

Multiply $- 4$ by $6$ .

$18 - 24 y + 6 (2 z) + y - 6 z = 17$

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

Step 3.2.4.1.1.2.3

Multiply $2$ by $6$ .

$18 - 24 y + 12 z + y - 6 z = 17$

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

$18 - 24 y + 12 z + y - 6 z = 17$

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

$18 - 24 y + 12 z + y - 6 z = 17$

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

Step 3.2.4.1.2

Simplify by adding terms.

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Step 3.2.4.1.2.1

Add $- 24 y$ and $y$ .

$18 - 23 y + 12 z - 6 z = 17$

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

Step 3.2.4.1.2.2

Subtract $6 z$ from $12 z$ .

$18 - 23 y + 6 z = 17$

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

$18 - 23 y + 6 z = 17$

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

$18 - 23 y + 6 z = 17$

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

$18 - 23 y + 6 z = 17$

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

$18 - 23 y + 6 z = 17$

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

Step 3.3

Solve for $y$ in $18 - 23 y + 6 z = 17$ .

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Step 3.3.1

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

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Step 3.3.1.1

Subtract $18$ from both sides of the equation.

$- 23 y + 6 z = 17 - 18$

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

Step 3.3.1.2

Subtract $6 z$ from both sides of the equation.

$- 23 y = 17 - 18 - 6 z$

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

Step 3.3.1.3

Subtract $18$ from $17$ .

$- 23 y = - 1 - 6 z$

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

$- 23 y = - 1 - 6 z$

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

Step 3.3.2

Divide each term in $- 23 y = - 1 - 6 z$ by $- 23$ and simplify.

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Step 3.3.2.1

Divide each term in $- 23 y = - 1 - 6 z$ by $- 23$ .

$\frac{- 23 y}{- 23} = \frac{- 1}{- 23} + \frac{- 6 z}{- 23}$

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

Step 3.3.2.2

Simplify the left side.

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Step 3.3.2.2.1

Cancel the common factor of $- 23$ .

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Step 3.3.2.2.1.1

Cancel the common factor.

$\frac{- 23 y}{- 23} = \frac{- 1}{- 23} + \frac{- 6 z}{- 23}$

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

Step 3.3.2.2.1.2

Divide $y$ by $1$ .

$y = \frac{- 1}{- 23} + \frac{- 6 z}{- 23}$

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

$y = \frac{- 1}{- 23} + \frac{- 6 z}{- 23}$

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

$y = \frac{- 1}{- 23} + \frac{- 6 z}{- 23}$

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

Step 3.3.2.3

Simplify the right side.

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Step 3.3.2.3.1

Simplify each term.

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Step 3.3.2.3.1.1

Dividing two negative values results in a positive value.

$y = \frac{1}{23} + \frac{- 6 z}{- 23}$

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

Step 3.3.2.3.1.2

Dividing two negative values results in a positive value.

$y = \frac{1}{23} + \frac{6 z}{23}$

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

$y = \frac{1}{23} + \frac{6 z}{23}$

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

$y = \frac{1}{23} + \frac{6 z}{23}$

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

$y = \frac{1}{23} + \frac{6 z}{23}$

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

$y = \frac{1}{23} + \frac{6 z}{23}$

$- 12 + 11 y - 3 z = - 11$

$x = 3 - 4 y + 2 z$

Step 3.4

Replace all occurrences of $y$ with $\frac{1}{23} + \frac{6 z}{23}$ in each equation.

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Step 3.4.1

Replace all occurrences of $y$ in $- 12 + 11 y - 3 z = - 11$ with $\frac{1}{23} + \frac{6 z}{23}$ .

$- 12 + 11 (\frac{1}{23} + \frac{6 z}{23}) - 3 z = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = 3 - 4 y + 2 z$

Step 3.4.2

Simplify the left side.

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Step 3.4.2.1

Simplify $- 12 + 11 (\frac{1}{23} + \frac{6 z}{23}) - 3 z$ .

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Step 3.4.2.1.1

Simplify each term.

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Step 3.4.2.1.1.1

Apply the distributive property.

$- 12 + 11 (\frac{1}{23}) + 11 (\frac{6 z}{23}) - 3 z = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = 3 - 4 y + 2 z$

Step 3.4.2.1.1.2

Combine $11$ and $\frac{1}{23}$ .

$- 12 + \frac{11}{23} + 11 (\frac{6 z}{23}) - 3 z = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = 3 - 4 y + 2 z$

Step 3.4.2.1.1.3

Multiply $11 \frac{6 z}{23}$ .

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Step 3.4.2.1.1.3.1

Combine $11$ and $\frac{6 z}{23}$ .

$- 12 + \frac{11}{23} + \frac{11 (6 z)}{23} - 3 z = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = 3 - 4 y + 2 z$

Step 3.4.2.1.1.3.2

Multiply $6$ by $11$ .

$- 12 + \frac{11}{23} + \frac{66 z}{23} - 3 z = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = 3 - 4 y + 2 z$

$- 12 + \frac{11}{23} + \frac{66 z}{23} - 3 z = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = 3 - 4 y + 2 z$

$- 12 + \frac{11}{23} + \frac{66 z}{23} - 3 z = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = 3 - 4 y + 2 z$

Step 3.4.2.1.2

To write $- 12$ as a fraction with a common denominator, multiply by $\frac{23}{23}$ .

$- 12 \cdot \frac{23}{23} + \frac{11}{23} + \frac{66 z}{23} - 3 z = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = 3 - 4 y + 2 z$

Step 3.4.2.1.3

Combine $- 12$ and $\frac{23}{23}$ .

$\frac{- 12 \cdot 23}{23} + \frac{11}{23} + \frac{66 z}{23} - 3 z = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = 3 - 4 y + 2 z$

Step 3.4.2.1.4

Combine the numerators over the common denominator.

$\frac{- 12 \cdot 23 + 11}{23} + \frac{66 z}{23} - 3 z = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = 3 - 4 y + 2 z$

Step 3.4.2.1.5

Simplify the numerator.

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Step 3.4.2.1.5.1

Multiply $- 12$ by $23$ .

$\frac{- 276 + 11}{23} + \frac{66 z}{23} - 3 z = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = 3 - 4 y + 2 z$

Step 3.4.2.1.5.2

Add $- 276$ and $11$ .

$\frac{- 265}{23} + \frac{66 z}{23} - 3 z = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = 3 - 4 y + 2 z$

$\frac{- 265}{23} + \frac{66 z}{23} - 3 z = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = 3 - 4 y + 2 z$

Step 3.4.2.1.6

Move the negative in front of the fraction.

$- \frac{265}{23} + \frac{66 z}{23} - 3 z = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = 3 - 4 y + 2 z$

Step 3.4.2.1.7

To write $- 3 z$ as a fraction with a common denominator, multiply by $\frac{23}{23}$ .

$- \frac{265}{23} + \frac{66 z}{23} - 3 z \cdot \frac{23}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = 3 - 4 y + 2 z$

Step 3.4.2.1.8

Combine $- 3 z$ and $\frac{23}{23}$ .

$- \frac{265}{23} + \frac{66 z}{23} + \frac{- 3 z \cdot 23}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = 3 - 4 y + 2 z$

Step 3.4.2.1.9

Combine the numerators over the common denominator.

$- \frac{265}{23} + \frac{66 z - 3 z \cdot 23}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = 3 - 4 y + 2 z$

Step 3.4.2.1.10

Combine the numerators over the common denominator.

$\frac{- 265 + 66 z - 3 z \cdot 23}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = 3 - 4 y + 2 z$

Step 3.4.2.1.11

Multiply $23$ by $- 3$ .

$\frac{- 265 + 66 z - 69 z}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = 3 - 4 y + 2 z$

Step 3.4.2.1.12

Subtract $69 z$ from $66 z$ .

$\frac{- 265 - 3 z}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = 3 - 4 y + 2 z$

Step 3.4.2.1.13

Rewrite $- 265$ as $- 1 (265)$ .

$\frac{- 1 \cdot 265 - 3 z}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = 3 - 4 y + 2 z$

Step 3.4.2.1.14

Factor $- 1$ out of $- 3 z$ .

$\frac{- 1 \cdot 265 - (3 z)}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = 3 - 4 y + 2 z$

Step 3.4.2.1.15

Factor $- 1$ out of $- 1 (265) - (3 z)$ .

$\frac{- 1 (265 + 3 z)}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = 3 - 4 y + 2 z$

Step 3.4.2.1.16

Move the negative in front of the fraction.

$- \frac{265 + 3 z}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = 3 - 4 y + 2 z$

$- \frac{265 + 3 z}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = 3 - 4 y + 2 z$

$- \frac{265 + 3 z}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = 3 - 4 y + 2 z$

Step 3.4.3

Replace all occurrences of $y$ in $x = 3 - 4 y + 2 z$ with $\frac{1}{23} + \frac{6 z}{23}$ .

$x = 3 - 4 (\frac{1}{23} + \frac{6 z}{23}) + 2 z$

$- \frac{265 + 3 z}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.4.4

Simplify the right side.

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Step 3.4.4.1

Simplify $3 - 4 (\frac{1}{23} + \frac{6 z}{23}) + 2 z$ .

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Step 3.4.4.1.1

Simplify each term.

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Step 3.4.4.1.1.1

Apply the distributive property.

$x = 3 - 4 (\frac{1}{23}) - 4 \frac{6 z}{23} + 2 z$

$- \frac{265 + 3 z}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.4.4.1.1.2

Combine $- 4$ and $\frac{1}{23}$ .

$x = 3 + \frac{- 4}{23} - 4 \frac{6 z}{23} + 2 z$

$- \frac{265 + 3 z}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.4.4.1.1.3

Multiply $- 4 \frac{6 z}{23}$ .

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Step 3.4.4.1.1.3.1

Combine $- 4$ and $\frac{6 z}{23}$ .

$x = 3 + \frac{- 4}{23} + \frac{- 4 (6 z)}{23} + 2 z$

$- \frac{265 + 3 z}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.4.4.1.1.3.2

Multiply $6$ by $- 4$ .

$x = 3 + \frac{- 4}{23} + \frac{- 24 z}{23} + 2 z$

$- \frac{265 + 3 z}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = 3 + \frac{- 4}{23} + \frac{- 24 z}{23} + 2 z$

$- \frac{265 + 3 z}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.4.4.1.1.4

Simplify each term.

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Step 3.4.4.1.1.4.1

Move the negative in front of the fraction.

$x = 3 - \frac{4}{23} + \frac{- 24 z}{23} + 2 z$

$- \frac{265 + 3 z}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.4.4.1.1.4.2

Move the negative in front of the fraction.

$x = 3 - \frac{4}{23} - \frac{24 z}{23} + 2 z$

$- \frac{265 + 3 z}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = 3 - \frac{4}{23} - \frac{24 z}{23} + 2 z$

$- \frac{265 + 3 z}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = 3 - \frac{4}{23} - \frac{24 z}{23} + 2 z$

$- \frac{265 + 3 z}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.4.4.1.2

To write $3$ as a fraction with a common denominator, multiply by $\frac{23}{23}$ .

$x = 3 \cdot \frac{23}{23} - \frac{4}{23} - \frac{24 z}{23} + 2 z$

$- \frac{265 + 3 z}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.4.4.1.3

Combine $3$ and $\frac{23}{23}$ .

$x = \frac{3 \cdot 23}{23} - \frac{4}{23} - \frac{24 z}{23} + 2 z$

$- \frac{265 + 3 z}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.4.4.1.4

Combine the numerators over the common denominator.

$x = \frac{3 \cdot 23 - 4}{23} - \frac{24 z}{23} + 2 z$

$- \frac{265 + 3 z}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.4.4.1.5

Simplify the numerator.

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Step 3.4.4.1.5.1

Multiply $3$ by $23$ .

$x = \frac{69 - 4}{23} - \frac{24 z}{23} + 2 z$

$- \frac{265 + 3 z}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.4.4.1.5.2

Subtract $4$ from $69$ .

$x = \frac{65}{23} - \frac{24 z}{23} + 2 z$

$- \frac{265 + 3 z}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = \frac{65}{23} - \frac{24 z}{23} + 2 z$

$- \frac{265 + 3 z}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.4.4.1.6

To write $2 z$ as a fraction with a common denominator, multiply by $\frac{23}{23}$ .

$x = \frac{65}{23} - \frac{24 z}{23} + 2 z \cdot \frac{23}{23}$

$- \frac{265 + 3 z}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.4.4.1.7

Combine $2 z$ and $\frac{23}{23}$ .

$x = \frac{65}{23} - \frac{24 z}{23} + \frac{2 z \cdot 23}{23}$

$- \frac{265 + 3 z}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.4.4.1.8

Combine the numerators over the common denominator.

$x = \frac{65}{23} + \frac{- 24 z + 2 z \cdot 23}{23}$

$- \frac{265 + 3 z}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.4.4.1.9

Combine the numerators over the common denominator.

$x = \frac{65 - 24 z + 2 z \cdot 23}{23}$

$- \frac{265 + 3 z}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.4.4.1.10

Multiply $23$ by $2$ .

$x = \frac{65 - 24 z + 46 z}{23}$

$- \frac{265 + 3 z}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.4.4.1.11

Add $- 24 z$ and $46 z$ .

$x = \frac{65 + 22 z}{23}$

$- \frac{265 + 3 z}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = \frac{65 + 22 z}{23}$

$- \frac{265 + 3 z}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = \frac{65 + 22 z}{23}$

$- \frac{265 + 3 z}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = \frac{65 + 22 z}{23}$

$- \frac{265 + 3 z}{23} = - 11$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.5

Solve for $z$ in $- \frac{265 + 3 z}{23} = - 11$ .

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Step 3.5.1

Multiply both sides of the equation by $- 23$ .

$- 23 (- \frac{265 + 3 z}{23}) = - 23 \cdot - 11$

$x = \frac{65 + 22 z}{23}$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.5.2

Simplify both sides of the equation.

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Step 3.5.2.1

Simplify the left side.

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Step 3.5.2.1.1

Simplify $- 23 (- \frac{265 + 3 z}{23})$ .

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Step 3.5.2.1.1.1

Cancel the common factor of $23$ .

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Step 3.5.2.1.1.1.1

Move the leading negative in $- \frac{265 + 3 z}{23}$ into the numerator.

$- 23 \frac{- (265 + 3 z)}{23} = - 23 \cdot - 11$

$x = \frac{65 + 22 z}{23}$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.5.2.1.1.1.2

Factor $23$ out of $- 23$ .

$23 (- 1) (\frac{- (265 + 3 z)}{23}) = - 23 \cdot - 11$

$x = \frac{65 + 22 z}{23}$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.5.2.1.1.1.3

Cancel the common factor.

$23 \cdot (- 1 \frac{- (265 + 3 z)}{23}) = - 23 \cdot - 11$

$x = \frac{65 + 22 z}{23}$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.5.2.1.1.1.4

Rewrite the expression.

$265 + 3 z = - 23 \cdot - 11$

$x = \frac{65 + 22 z}{23}$

$y = \frac{1}{23} + \frac{6 z}{23}$

$265 + 3 z = - 23 \cdot - 11$

$x = \frac{65 + 22 z}{23}$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.5.2.1.1.2

Multiply.

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Step 3.5.2.1.1.2.1

Multiply $- 1$ by $- 1$ .

$1 (265 + 3 z) = - 23 \cdot - 11$

$x = \frac{65 + 22 z}{23}$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.5.2.1.1.2.2

Multiply $265 + 3 z$ by $1$ .

$265 + 3 z = - 23 \cdot - 11$

$x = \frac{65 + 22 z}{23}$

$y = \frac{1}{23} + \frac{6 z}{23}$

$265 + 3 z = - 23 \cdot - 11$

$x = \frac{65 + 22 z}{23}$

$y = \frac{1}{23} + \frac{6 z}{23}$

$265 + 3 z = - 23 \cdot - 11$

$x = \frac{65 + 22 z}{23}$

$y = \frac{1}{23} + \frac{6 z}{23}$

$265 + 3 z = - 23 \cdot - 11$

$x = \frac{65 + 22 z}{23}$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.5.2.2

Simplify the right side.

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Step 3.5.2.2.1

Multiply $- 23$ by $- 11$ .

$265 + 3 z = 253$

$x = \frac{65 + 22 z}{23}$

$y = \frac{1}{23} + \frac{6 z}{23}$

$265 + 3 z = 253$

$x = \frac{65 + 22 z}{23}$

$y = \frac{1}{23} + \frac{6 z}{23}$

$265 + 3 z = 253$

$x = \frac{65 + 22 z}{23}$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.5.3

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

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Step 3.5.3.1

Subtract $265$ from both sides of the equation.

$3 z = 253 - 265$

$x = \frac{65 + 22 z}{23}$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.5.3.2

Subtract $265$ from $253$ .

$3 z = - 12$

$x = \frac{65 + 22 z}{23}$

$y = \frac{1}{23} + \frac{6 z}{23}$

$3 z = - 12$

$x = \frac{65 + 22 z}{23}$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.5.4

Divide each term in $3 z = - 12$ by $3$ and simplify.

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Step 3.5.4.1

Divide each term in $3 z = - 12$ by $3$ .

$\frac{3 z}{3} = \frac{- 12}{3}$

$x = \frac{65 + 22 z}{23}$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.5.4.2

Simplify the left side.

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Step 3.5.4.2.1

Cancel the common factor of $3$ .

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Step 3.5.4.2.1.1

Cancel the common factor.

$\frac{3 z}{3} = \frac{- 12}{3}$

$x = \frac{65 + 22 z}{23}$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.5.4.2.1.2

Divide $z$ by $1$ .

$z = \frac{- 12}{3}$

$x = \frac{65 + 22 z}{23}$

$y = \frac{1}{23} + \frac{6 z}{23}$

$z = \frac{- 12}{3}$

$x = \frac{65 + 22 z}{23}$

$y = \frac{1}{23} + \frac{6 z}{23}$

$z = \frac{- 12}{3}$

$x = \frac{65 + 22 z}{23}$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.5.4.3

Simplify the right side.

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Step 3.5.4.3.1

Divide $- 12$ by $3$ .

$z = - 4$

$x = \frac{65 + 22 z}{23}$

$y = \frac{1}{23} + \frac{6 z}{23}$

$z = - 4$

$x = \frac{65 + 22 z}{23}$

$y = \frac{1}{23} + \frac{6 z}{23}$

$z = - 4$

$x = \frac{65 + 22 z}{23}$

$y = \frac{1}{23} + \frac{6 z}{23}$

$z = - 4$

$x = \frac{65 + 22 z}{23}$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.6

Replace all occurrences of $z$ with $- 4$ in each equation.

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Step 3.6.1

Replace all occurrences of $z$ in $x = \frac{65 + 22 z}{23}$ with $- 4$ .

$x = \frac{65 + 22 (- 4)}{23}$

$z = - 4$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.6.2

Simplify the right side.

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Step 3.6.2.1

Simplify $\frac{65 + 22 (- 4)}{23}$ .

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Step 3.6.2.1.1

Simplify the numerator.

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Step 3.6.2.1.1.1

Multiply $22$ by $- 4$ .

$x = \frac{65 - 88}{23}$

$z = - 4$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.6.2.1.1.2

Subtract $88$ from $65$ .

$x = \frac{- 23}{23}$

$z = - 4$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = \frac{- 23}{23}$

$z = - 4$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.6.2.1.2

Divide $- 23$ by $23$ .

$x = - 1$

$z = - 4$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = - 1$

$z = - 4$

$y = \frac{1}{23} + \frac{6 z}{23}$

$x = - 1$

$z = - 4$

$y = \frac{1}{23} + \frac{6 z}{23}$

Step 3.6.3

Replace all occurrences of $z$ in $y = \frac{1}{23} + \frac{6 z}{23}$ with $- 4$ .

$y = \frac{1}{23} + \frac{6 (- 4)}{23}$

$x = - 1$

$z = - 4$

Step 3.6.4

Simplify the right side.

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Step 3.6.4.1

Simplify $\frac{1}{23} + \frac{6 (- 4)}{23}$ .

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Step 3.6.4.1.1

Combine the numerators over the common denominator.

$y = \frac{1 + 6 (- 4)}{23}$

$x = - 1$

$z = - 4$

Step 3.6.4.1.2

Simplify the expression.

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Step 3.6.4.1.2.1

Multiply $6$ by $- 4$ .

$y = \frac{1 - 24}{23}$

$x = - 1$

$z = - 4$

Step 3.6.4.1.2.2

Subtract $24$ from $1$ .

$y = \frac{- 23}{23}$

$x = - 1$

$z = - 4$

Step 3.6.4.1.2.3

Divide $- 23$ by $23$ .

$y = - 1$

$x = - 1$

$z = - 4$

$y = - 1$

$x = - 1$

$z = - 4$

$y = - 1$

$x = - 1$

$z = - 4$

$y = - 1$

$x = - 1$

$z = - 4$

$y = - 1$

$x = - 1$

$z = - 4$

Step 3.7

List all of the solutions.

$y = - 1, x = - 1, z = - 4$