Pre-Algebra Examples

$- 3 x - y < 2$

Step 1

Write in $y = m x + b$ form.

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Step 1.1

Solve for $y$ .

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Step 1.1.1

Add $3 x$ to both sides of the inequality.

$- y < 2 + 3 x$

Step 1.1.2

Divide each term in $- y < 2 + 3 x$ by $- 1$ and simplify.

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Step 1.1.2.1

Divide each term in $- y < 2 + 3 x$ by $- 1$ . When multiplying or dividing both sides of an inequality by a negative value, flip the direction of the inequality sign.

$\frac{- y}{- 1} > \frac{2}{- 1} + \frac{3 x}{- 1}$

Step 1.1.2.2

Simplify the left side.

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Step 1.1.2.2.1

Dividing two negative values results in a positive value.

$\frac{y}{1} > \frac{2}{- 1} + \frac{3 x}{- 1}$

Step 1.1.2.2.2

Divide $y$ by $1$ .

$y > \frac{2}{- 1} + \frac{3 x}{- 1}$

Step 1.1.2.3

Simplify the right side.

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Step 1.1.2.3.1

Simplify each term.

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Step 1.1.2.3.1.1

Divide $2$ by $- 1$ .

$y > - 2 + \frac{3 x}{- 1}$

Step 1.1.2.3.1.2

Move the negative one from the denominator of $\frac{3 x}{- 1}$ .

$y > - 2 - 1 \cdot (3 x)$

Step 1.1.2.3.1.3

Rewrite $- 1 \cdot (3 x)$ as $- (3 x)$ .

$y > - 2 - (3 x)$

Step 1.1.2.3.1.4

Multiply $3$ by $- 1$ .

$y > - 2 - 3 x$

Step 1.2

Rearrange terms.

$y > - 3 x - 2$

Step 2

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

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Step 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 2.2

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

$m = - 3$

$b = - 2$

Step 2.3

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

Slope: $- 3$

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

Slope: $- 3$

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

Step 3

Graph a dashed line, then shade the area above the boundary line since $y$ is greater than $- 3 x - 2$ .

$y > - 3 x - 2$

Step 4