Algebra Examples

$y = 2 x - 4$

Step 1

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

$y = 2 (- 2) - 4$

Step 2

Simplify $2 (- 2) - 4$ .

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Step 2.1

Multiply $2$ by $- 2$ .

$y = - 4 - 4$

Step 2.2

Subtract $4$ from $- 4$ .

$y = - 8$

Step 3

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

$y = 2 (- 1) - 4$

Step 4

Simplify $2 (- 1) - 4$ .

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Step 4.1

Multiply $2$ by $- 1$ .

$y = - 2 - 4$

Step 4.2

Subtract $4$ from $- 2$ .

$y = - 6$

Step 5

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

$y = 2 (0) - 4$

Step 6

Solve the equation for $y$ .

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Step 6.1

Remove parentheses.

$y = 2 (0) - 4$

Step 6.2

Simplify $2 (0) - 4$ .

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Step 6.2.1

Multiply $2$ by $0$ .

$y = 0 - 4$

Step 6.2.2

Subtract $4$ from $0$ .

$y = - 4$

Step 7

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

$y = 2 (1) - 4$

Step 8

Solve the equation for $y$ .

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Step 8.1

Remove parentheses.

$y = 2 (1) - 4$

Step 8.2

Simplify $2 (1) - 4$ .

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Step 8.2.1

Multiply $2$ by $1$ .

$y = 2 - 4$

Step 8.2.2

Subtract $4$ from $2$ .

$y = - 2$

Step 9

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

$y = 2 (2) - 4$

Step 10

Solve the equation for $y$ .

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Step 10.1

Remove parentheses.

$y = 2 (2) - 4$

Step 10.2

Simplify $2 (2) - 4$ .

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Step 10.2.1

Multiply $2$ by $2$ .

$y = 4 - 4$

Step 10.2.2

Subtract $4$ from $4$ .

$y = 0$

Step 11

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

$\begin{array}{c} x & y \\ - 2 & - 8 \\ - 1 & - 6 \\ 0 & - 4 \\ 1 & - 2 \\ 2 & 0 \end{array}$

Step 12