Precalculus Examples

$4 x - 5 y = 20$

Step 1

Rewrite in slope-intercept form.

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Step 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 1.2

Subtract $4 x$ from both sides of the equation.

$- 5 y = 20 - 4 x$

Step 1.3

Divide each term in $- 5 y = 20 - 4 x$ by $- 5$ and simplify.

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Step 1.3.1

Divide each term in $- 5 y = 20 - 4 x$ by $- 5$ .

$\frac{- 5 y}{- 5} = \frac{20}{- 5} + \frac{- 4 x}{- 5}$

Step 1.3.2

Simplify the left side.

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Step 1.3.2.1

Cancel the common factor of $- 5$ .

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Step 1.3.2.1.1

Cancel the common factor.

$\frac{- 5 y}{- 5} = \frac{20}{- 5} + \frac{- 4 x}{- 5}$

Step 1.3.2.1.2

Divide $y$ by $1$ .

$y = \frac{20}{- 5} + \frac{- 4 x}{- 5}$

Step 1.3.3

Simplify the right side.

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Step 1.3.3.1

Simplify each term.

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Step 1.3.3.1.1

Divide $20$ by $- 5$ .

$y = - 4 + \frac{- 4 x}{- 5}$

Step 1.3.3.1.2

Dividing two negative values results in a positive value.

$y = - 4 + \frac{4 x}{5}$

Step 1.4

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

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Step 1.4.1

Reorder $- 4$ and $\frac{4 x}{5}$ .

$y = \frac{4 x}{5} - 4$

Step 1.4.2

Reorder terms.

$y = \frac{4}{5} x - 4$

Step 2

Using the slope-intercept form, the slope is $\frac{4}{5}$ .

$m = \frac{4}{5}$

Step 3