Pre-Algebra Examples

$4 x + 2 y < 12$

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 $4 x$ from both sides of the inequality.

$2 y < 12 - 4 x$

Step 1.1.2

Divide each term in $2 y < 12 - 4 x$ by $2$ and simplify.

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Step 1.1.2.1

Divide each term in $2 y < 12 - 4 x$ by $2$ .

$\frac{2 y}{2} < \frac{12}{2} + \frac{- 4 x}{2}$

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.

$\frac{2 y}{2} < \frac{12}{2} + \frac{- 4 x}{2}$

Step 1.1.2.2.1.2

Divide $y$ by $1$ .

$y < \frac{12}{2} + \frac{- 4 x}{2}$

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 $12$ by $2$ .

$y < 6 + \frac{- 4 x}{2}$

Step 1.1.2.3.1.2

Cancel the common factor of $- 4$ and $2$ .

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Step 1.1.2.3.1.2.1

Factor $2$ out of $- 4 x$ .

$y < 6 + \frac{2 (- 2 x)}{2}$

Step 1.1.2.3.1.2.2

Cancel the common factors.

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Step 1.1.2.3.1.2.2.1

Factor $2$ out of $2$ .

$y < 6 + \frac{2 (- 2 x)}{2 (1)}$

Step 1.1.2.3.1.2.2.2

Cancel the common factor.

$y < 6 + \frac{2 (- 2 x)}{2 \cdot 1}$

Step 1.1.2.3.1.2.2.3

Rewrite the expression.

$y < 6 + \frac{- 2 x}{1}$

Step 1.1.2.3.1.2.2.4

Divide $- 2 x$ by $1$ .

$y < 6 - 2 x$

Step 1.2

Rearrange terms.

$y < - 2 x + 6$

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 $y = m x + b$ .

$m = - 2$

$b = 6$

Step 2.3

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

Slope: $- 2$

y-intercept: $(0, 6)$

Slope: $- 2$

y-intercept: $(0, 6)$

Step 3

Graph a dashed line, then shade the area below the boundary line since $y$ is less than $- 2 x + 6$ .

$y < - 2 x + 6$

Step 4