Pre-Algebra Examples

$y \geq x + 2$ , $y \leq x - 2$

Step 1

Graph $y \geq x + 2$ .

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Step 1.1

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

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Step 1.1.1

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 1.1.2

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

$m = 1$

$b = 2$

Step 1.1.3

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 1.2

Graph a solid line, then shade the area above the boundary line since $y$ is greater than $x + 2$ .

$y \geq x + 2$

Step 2

Graph $y \leq x - 2$ .

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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 $y = m x + b$ .

$m = 1$

$b = - 2$

Step 2.1.3

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 2.2

Graph a solid line, then shade the area below the boundary line since $y$ is less than $x - 2$ .

$y \leq x - 2$

Step 3

Plot each graph on the same coordinate system.

$y \geq x + 2$

$y \leq x - 2$

Step 4