Pre-Algebra Examples

$x - 2 y < 4$

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

Subtract $x$ from both sides of the inequality.

$- 2 y < 4 - x$

Step 1.1.2

Divide each term in $- 2 y < 4 - x$ by $- 2$ and simplify.

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Step 1.1.2.1

Divide each term in $- 2 y < 4 - x$ by $- 2$ . When multiplying or dividing both sides of an inequality by a negative value, flip the direction of the inequality sign.

$\frac{- 2 y}{- 2} > \frac{4}{- 2} + \frac{- x}{- 2}$

Step 1.1.2.2

Simplify the left side.

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Step 1.1.2.2.1

Cancel the common factor of $- 2$ .

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Step 1.1.2.2.1.1

Cancel the common factor.

$\frac{- 2 y}{- 2} > \frac{4}{- 2} + \frac{- x}{- 2}$

Step 1.1.2.2.1.2

Divide $y$ by $1$ .

$y > \frac{4}{- 2} + \frac{- x}{- 2}$

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 $4$ by $- 2$ .

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

Step 1.1.2.3.1.2

Dividing two negative values results in a positive value.

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

Step 1.2

Rearrange terms.

$y > \frac{x}{2} - 2$

Step 1.3

Reorder terms.

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

Step 2

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

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Step 2.1

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

$m = \frac{1}{2}$

$b = - 2$

Step 2.2

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

Slope: $\frac{1}{2}$

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

Slope: $\frac{1}{2}$

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

Step 3

Graph a dashed line, then shade the area above the boundary line since $y$ is greater than $\frac{1}{2} x - 2$ .

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

Step 4