Precalculus Examples

$(- 9, - 25)$ , $(- 8, 48)$

Step 1

Slope is equal to the change in $y$ over the change in $x$ , or rise over run.

$m = \frac{change in y}{change in x}$

Step 2

The change in $x$ is equal to the difference in x-coordinates (also called run), and the change in $y$ is equal to the difference in y-coordinates (also called rise).

$m = \frac{y_{2} - y_{1}}{x_{2} - x_{1}}$

Step 3

Substitute in the values of $x$ and $y$ into the equation to find the slope.

$m = \frac{48 - (- 25)}{- 8 - (- 9)}$

Step 4

Simplify.

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Step 4.1

Simplify the numerator.

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Step 4.1.1

Multiply $- 1$ by $- 25$ .

$m = \frac{48 + 25}{- 8 - (- 9)}$

Step 4.1.2

Add $48$ and $25$ .

$m = \frac{73}{- 8 - (- 9)}$

Step 4.2

Simplify the denominator.

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Step 4.2.1

Multiply $- 1$ by $- 9$ .

$m = \frac{73}{- 8 + 9}$

Step 4.2.2

Add $- 8$ and $9$ .

$m = \frac{73}{1}$

Step 4.3

Divide $73$ by $1$ .

$m = 73$

Step 5