Pre-Algebra Examples

$x - 4 y = 12$

Step 1

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

$(- 2) - 4 y = 12$

Step 2

Solve the equation for $y$ .

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Step 2.1

Remove parentheses.

$- 2 - 4 y = 12$

Step 2.2

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

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Step 2.2.1

Add $2$ to both sides of the equation.

$- 4 y = 12 + 2$

Step 2.2.2

Add $12$ and $2$ .

$- 4 y = 14$

Step 2.3

Divide each term in $- 4 y = 14$ by $- 4$ and simplify.

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Step 2.3.1

Divide each term in $- 4 y = 14$ by $- 4$ .

$\frac{- 4 y}{- 4} = \frac{14}{- 4}$

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.

$\frac{- 4 y}{- 4} = \frac{14}{- 4}$

Step 2.3.2.1.2

Divide $y$ by $1$ .

$y = \frac{14}{- 4}$

Step 2.3.3

Simplify the right side.

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Step 2.3.3.1

Cancel the common factor of $14$ and $- 4$ .

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Step 2.3.3.1.1

Factor $2$ out of $14$ .

$y = \frac{2 (7)}{- 4}$

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 $- 4$ .

$y = \frac{2 \cdot 7}{2 \cdot - 2}$

Step 2.3.3.1.2.2

Cancel the common factor.

$y = \frac{2 \cdot 7}{2 \cdot - 2}$

Step 2.3.3.1.2.3

Rewrite the expression.

$y = \frac{7}{- 2}$

Step 2.3.3.2

Move the negative in front of the fraction.

$y = - \frac{7}{2}$

Step 3

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

$(- 1) - 4 y = 12$

Step 4

Solve the equation for $y$ .

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Step 4.1

Remove parentheses.

$- 1 - 4 y = 12$

Step 4.2

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

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Step 4.2.1

Add $1$ to both sides of the equation.

$- 4 y = 12 + 1$

Step 4.2.2

Add $12$ and $1$ .

$- 4 y = 13$

Step 4.3

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

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Step 4.3.1

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

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

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.

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

Step 4.3.2.1.2

Divide $y$ by $1$ .

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

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.

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

Step 5

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

$(0) - 4 y = 12$

Step 6

Solve the equation for $y$ .

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Step 6.1

Subtract $4 y$ from $0$ .

$- 4 y = 12$

Step 6.2

Divide each term in $- 4 y = 12$ by $- 4$ and simplify.

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Step 6.2.1

Divide each term in $- 4 y = 12$ by $- 4$ .

$\frac{- 4 y}{- 4} = \frac{12}{- 4}$

Step 6.2.2

Simplify the left side.

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Step 6.2.2.1

Cancel the common factor of $- 4$ .

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Step 6.2.2.1.1

Cancel the common factor.

$\frac{- 4 y}{- 4} = \frac{12}{- 4}$

Step 6.2.2.1.2

Divide $y$ by $1$ .

$y = \frac{12}{- 4}$

Step 6.2.3

Simplify the right side.

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Step 6.2.3.1

Divide $12$ by $- 4$ .

$y = - 3$

Step 7

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

$(1) - 4 y = 12$

Step 8

Solve the equation for $y$ .

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Step 8.1

Remove parentheses.

$1 - 4 y = 12$

Step 8.2

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

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Step 8.2.1

Subtract $1$ from both sides of the equation.

$- 4 y = 12 - 1$

Step 8.2.2

Subtract $1$ from $12$ .

$- 4 y = 11$

Step 8.3

Divide each term in $- 4 y = 11$ by $- 4$ and simplify.

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Step 8.3.1

Divide each term in $- 4 y = 11$ by $- 4$ .

$\frac{- 4 y}{- 4} = \frac{11}{- 4}$

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.

$\frac{- 4 y}{- 4} = \frac{11}{- 4}$

Step 8.3.2.1.2

Divide $y$ by $1$ .

$y = \frac{11}{- 4}$

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.

$y = - \frac{11}{4}$

Step 9

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

$(2) - 4 y = 12$

Step 10

Solve the equation for $y$ .

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Step 10.1

Remove parentheses.

$2 - 4 y = 12$

Step 10.2

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

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Step 10.2.1

Subtract $2$ from both sides of the equation.

$- 4 y = 12 - 2$

Step 10.2.2

Subtract $2$ from $12$ .

$- 4 y = 10$

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.

$\begin{array}{c} x & y \\ - 2 & - \frac{7}{2} \\ - 1 & - \frac{13}{4} \\ 0 & - 3 \\ 1 & - \frac{11}{4} \\ 2 & - \frac{5}{2} \end{array}$

Step 12