Pre-Algebra Examples

$y = 3 x + 4$

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

$y = 3 (- 2) + 4$

Simplify $3 (- 2) + 4$ .

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Multiply $3$ by $- 2$ .

$y = - 6 + 4$

Add $- 6$ and $4$ .

$y = - 2$

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

$y = 3 (- 1) + 4$

Simplify $3 (- 1) + 4$ .

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Multiply $3$ by $- 1$ .

$y = - 3 + 4$

Add $- 3$ and $4$ .

$y = 1$

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

$y = 3 (0) + 4$

Simplify $3 (0) + 4$ .

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Multiply $3$ by $0$ .

$y = 0 + 4$

Add $0$ and $4$ .

$y = 4$

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

$y = 3 (1) + 4$

Simplify $3 (1) + 4$ .

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Multiply $3$ by $1$ .

$y = 3 + 4$

Add $3$ and $4$ .

$y = 7$

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

$y = 3 (2) + 4$

Simplify $3 (2) + 4$ .

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Multiply $3$ by $2$ .

$y = 6 + 4$

Add $6$ and $4$ .

$y = 10$

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

$\begin{array}{c} x & y \\ - 2 & - 2 \\ - 1 & 1 \\ 0 & 4 \\ 1 & 7 \\ 2 & 10 \end{array}$

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