Algebra Examples

$x + y = - 2$ $y = 5 x + 4$

Step 1

Graph $x + y = - 2$ .

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Step 1.1

Subtract $x$ from both sides of the equation.

$y = - 2 - x$

Step 1.2

Rewrite in slope-intercept form.

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Step 1.2.1

The slope-intercept form is $y = m x + b$ , where $m$ is the slope and $b$ is the y-intercept.

$y = m x + b$

Step 1.2.2

Reorder $- 2$ and $- x$ .

$y = - x - 2$

Step 1.3

Use the slope-intercept form to find the slope and y-intercept.

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Step 1.3.1

Find the values of $m$ and $b$ using the form $y = m x + b$ .

$m = - 1$

$b = - 2$

Step 1.3.2

The slope of the line is the value of $m$ , and the y-intercept is the value of $b$ .

Slope: $- 1$

y-intercept: $(0, - 2)$

Slope: $- 1$

y-intercept: $(0, - 2)$

Step 1.4

Any line can be graphed using two points. Select two $x$ values, and plug them into the equation to find the corresponding $y$ values.

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Step 1.4.1

Reorder $- 2$ and $- x$ .

$y = - x - 2$

Step 1.4.2

Create a table of the $x$ and $y$ values.

$\begin{array}{c} x & y \\ 0 & - 2 \\ 1 & - 3 \end{array}$

Step 1.5

Graph the line using the slope and the y-intercept, or the points.

Slope: $- 1$

y-intercept: $(0, - 2)$

$\begin{array}{c} x & y \\ 0 & - 2 \\ 1 & - 3 \end{array}$

Slope: $- 1$

y-intercept: $(0, - 2)$

$\begin{array}{c} x & y \\ 0 & - 2 \\ 1 & - 3 \end{array}$

Step 2

Graph $y = 5 x + 4$ .

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Step 2.1

Use the slope-intercept form to find the slope and y-intercept.

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Step 2.1.1

The slope-intercept form is $y = m x + b$ , where $m$ is the slope and $b$ is the y-intercept.

$y = m x + b$

Step 2.1.2

Find the values of $m$ and $b$ using the form $y = m x + b$ .

$m = 5$

$b = 4$

Step 2.1.3

The slope of the line is the value of $m$ , and the y-intercept is the value of $b$ .

Slope: $5$

y-intercept: $(0, 4)$

Slope: $5$

y-intercept: $(0, 4)$

Step 2.2

Any line can be graphed using two points. Select two $x$ values, and plug them into the equation to find the corresponding $y$ values.

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Step 2.2.1

Create a table of the $x$ and $y$ values.

$\begin{array}{c} x & y \\ 0 & 4 \\ 1 & 9 \end{array}$

Step 2.3

Graph the line using the slope and the y-intercept, or the points.

Slope: $5$

y-intercept: $(0, 4)$

$\begin{array}{c} x & y \\ 0 & 4 \\ 1 & 9 \end{array}$

Slope: $5$

y-intercept: $(0, 4)$

$\begin{array}{c} x & y \\ 0 & 4 \\ 1 & 9 \end{array}$

Step 3

Plot each graph on the same coordinate system.

$x + y = - 2$

$y = 5 x + 4$

Step 4