Pre-Algebra Examples

$3 x - 4 y - 16 = 0$

Step 1

Substitute $- 2$ for $x$ and find the result for $y$ .

$3 (- 2) - 4 y - 16 = 0$

Step 2

Solve the equation for $y$ .

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Step 2.1

Simplify $3 (- 2) - 4 y - 16$ .

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Step 2.1.1

Multiply $3$ by $- 2$ .

$- 6 - 4 y - 16 = 0$

Step 2.1.2

Subtract $16$ from $- 6$ .

$- 4 y - 22 = 0$

Step 2.2

Add $22$ to both sides of the equation.

$- 4 y = 22$

Step 2.3

Divide each term in $- 4 y = 22$ by $- 4$ and simplify.

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Step 2.3.1

Divide each term in $- 4 y = 22$ by $- 4$ .

$\frac{- 4 y}{- 4} = \frac{22}{- 4}$

Step 2.3.2

Simplify the left side.

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Step 2.3.2.1

Cancel the common factor of $- 4$ .

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Step 2.3.2.1.1

Cancel the common factor.

$\frac{- 4 y}{- 4} = \frac{22}{- 4}$

Step 2.3.2.1.2

Divide $y$ by $1$ .

$y = \frac{22}{- 4}$

Step 2.3.3

Simplify the right side.

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Step 2.3.3.1

Cancel the common factor of $22$ and $- 4$ .

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Step 2.3.3.1.1

Factor $2$ out of $22$ .

$y = \frac{2 (11)}{- 4}$

Step 2.3.3.1.2

Cancel the common factors.

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Step 2.3.3.1.2.1

Factor $2$ out of $- 4$ .

$y = \frac{2 \cdot 11}{2 \cdot - 2}$

Step 2.3.3.1.2.2

Cancel the common factor.

$y = \frac{2 \cdot 11}{2 \cdot - 2}$

Step 2.3.3.1.2.3

Rewrite the expression.

$y = \frac{11}{- 2}$

Step 2.3.3.2

Move the negative in front of the fraction.

$y = - \frac{11}{2}$

Step 3

Substitute $- 1$ for $x$ and find the result for $y$ .

$3 (- 1) - 4 y - 16 = 0$

Step 4

Solve the equation for $y$ .

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Step 4.1

Simplify $3 (- 1) - 4 y - 16$ .

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Step 4.1.1

Multiply $3$ by $- 1$ .

$- 3 - 4 y - 16 = 0$

Step 4.1.2

Subtract $16$ from $- 3$ .

$- 4 y - 19 = 0$

Step 4.2

Add $19$ to both sides of the equation.

$- 4 y = 19$

Step 4.3

Divide each term in $- 4 y = 19$ by $- 4$ and simplify.

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Step 4.3.1

Divide each term in $- 4 y = 19$ by $- 4$ .

$\frac{- 4 y}{- 4} = \frac{19}{- 4}$

Step 4.3.2

Simplify the left side.

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Step 4.3.2.1

Cancel the common factor of $- 4$ .

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Step 4.3.2.1.1

Cancel the common factor.

$\frac{- 4 y}{- 4} = \frac{19}{- 4}$

Step 4.3.2.1.2

Divide $y$ by $1$ .

$y = \frac{19}{- 4}$

Step 4.3.3

Simplify the right side.

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Step 4.3.3.1

Move the negative in front of the fraction.

$y = - \frac{19}{4}$

Step 5

Substitute $0$ for $x$ and find the result for $y$ .

$3 (0) - 4 y - 16 = 0$

Step 6

Solve the equation for $y$ .

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Step 6.1

Simplify $3 (0) - 4 y - 16$ .

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Step 6.1.1

Multiply $3$ by $0$ .

$0 - 4 y - 16 = 0$

Step 6.1.2

Subtract $4 y$ from $0$ .

$- 4 y - 16 = 0$

Step 6.2

Add $16$ to both sides of the equation.

$- 4 y = 16$

Step 6.3

Divide each term in $- 4 y = 16$ by $- 4$ and simplify.

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Step 6.3.1

Divide each term in $- 4 y = 16$ by $- 4$ .

$\frac{- 4 y}{- 4} = \frac{16}{- 4}$

Step 6.3.2

Simplify the left side.

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Step 6.3.2.1

Cancel the common factor of $- 4$ .

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Step 6.3.2.1.1

Cancel the common factor.

$\frac{- 4 y}{- 4} = \frac{16}{- 4}$

Step 6.3.2.1.2

Divide $y$ by $1$ .

$y = \frac{16}{- 4}$

Step 6.3.3

Simplify the right side.

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Step 6.3.3.1

Divide $16$ by $- 4$ .

$y = - 4$

Step 7

Substitute $1$ for $x$ and find the result for $y$ .

$3 (1) - 4 y - 16 = 0$

Step 8

Solve the equation for $y$ .

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Step 8.1

Simplify $3 (1) - 4 y - 16$ .

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Step 8.1.1

Multiply $3$ by $1$ .

$3 - 4 y - 16 = 0$

Step 8.1.2

Subtract $16$ from $3$ .

$- 4 y - 13 = 0$

Step 8.2

Add $13$ to both sides of the equation.

$- 4 y = 13$

Step 8.3

Divide each term in $- 4 y = 13$ by $- 4$ and simplify.

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Step 8.3.1

Divide each term in $- 4 y = 13$ by $- 4$ .

$\frac{- 4 y}{- 4} = \frac{13}{- 4}$

Step 8.3.2

Simplify the left side.

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Step 8.3.2.1

Cancel the common factor of $- 4$ .

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Step 8.3.2.1.1

Cancel the common factor.

$\frac{- 4 y}{- 4} = \frac{13}{- 4}$

Step 8.3.2.1.2

Divide $y$ by $1$ .

$y = \frac{13}{- 4}$

Step 8.3.3

Simplify the right side.

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Step 8.3.3.1

Move the negative in front of the fraction.

$y = - \frac{13}{4}$

Step 9

Substitute $2$ for $x$ and find the result for $y$ .

$3 (2) - 4 y - 16 = 0$

Step 10

Solve the equation for $y$ .

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Step 10.1

Simplify $3 (2) - 4 y - 16$ .

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Step 10.1.1

Multiply $3$ by $2$ .

$6 - 4 y - 16 = 0$

Step 10.1.2

Subtract $16$ from $6$ .

$- 4 y - 10 = 0$

Step 10.2

Add $10$ to both sides of the equation.

$- 4 y = 10$

Step 10.3

Divide each term in $- 4 y = 10$ by $- 4$ and simplify.

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Step 10.3.1

Divide each term in $- 4 y = 10$ by $- 4$ .

$\frac{- 4 y}{- 4} = \frac{10}{- 4}$

Step 10.3.2

Simplify the left side.

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Step 10.3.2.1

Cancel the common factor of $- 4$ .

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Step 10.3.2.1.1

Cancel the common factor.

$\frac{- 4 y}{- 4} = \frac{10}{- 4}$

Step 10.3.2.1.2

Divide $y$ by $1$ .

$y = \frac{10}{- 4}$

Step 10.3.3

Simplify the right side.

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Step 10.3.3.1

Cancel the common factor of $10$ and $- 4$ .

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Step 10.3.3.1.1

Factor $2$ out of $10$ .

$y = \frac{2 (5)}{- 4}$

Step 10.3.3.1.2

Cancel the common factors.

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Step 10.3.3.1.2.1

Factor $2$ out of $- 4$ .

$y = \frac{2 \cdot 5}{2 \cdot - 2}$

Step 10.3.3.1.2.2

Cancel the common factor.

$y = \frac{2 \cdot 5}{2 \cdot - 2}$

Step 10.3.3.1.2.3

Rewrite the expression.

$y = \frac{5}{- 2}$

Step 10.3.3.2

Move the negative in front of the fraction.

$y = - \frac{5}{2}$

Step 11

This is a table of possible values to use when graphing the equation.

$\begin{array}{c} x & y \\ - 2 & - \frac{11}{2} \\ - 1 & - \frac{19}{4} \\ 0 & - 4 \\ 1 & - \frac{13}{4} \\ 2 & - \frac{5}{2} \end{array}$

Step 12