Find the Equation Using Point-Slope Formula (0,2) , (-1,-2)

$(0, 2)$ , $(- 1, - 2)$

Step 1

Find the slope of the line between $(0, 2)$ and $(- 1, - 2)$ using $m = \frac{y_{2} - y_{1}}{x_{2} - x_{1}}$ , which is the change of $y$ over the change of $x$ .

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

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

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).

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

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

$m = \frac{- 2 - (2)}{- 1 - (0)}$

Simplify.

Simplify the numerator.

Multiply $- 1$ by $2$ .

$m = \frac{- 2 - 2}{- 1 - (0)}$

Subtract $2$ from $- 2$ .

$m = \frac{- 4}{- 1 - (0)}$

Simplify the denominator.

Multiply $- 1$ by $0$ .

$m = \frac{- 4}{- 1 + 0}$

Add $- 1$ and $0$ .

$m = \frac{- 4}{- 1}$

Divide $- 4$ by $- 1$ .

$m = 4$

Step 2

Use the slope $4$ and a given point $(0, 2)$ to substitute for $x_{1}$ and $y_{1}$ in the point-slope form $y - y_{1} = m (x - x_{1})$ , which is derived from the slope equation $m = \frac{y_{2} - y_{1}}{x_{2} - x_{1}}$ .

$y - (2) = 4 \cdot (x - (0))$

Step 3

Simplify the equation and keep it in point-slope form.

$y - 2 = 4 \cdot (x + 0)$

Step 4

Solve for $y$ .

Add $x$ and $0$ .

$y - 2 = 4 x$

Add $2$ to both sides of the equation.

$y = 4 x + 2$

Step 5

List the equation in different forms.

Slope-intercept form:

$y = 4 x + 2$

Point-slope form:

$y - 2 = 4 \cdot (x + 0)$

Step 6

Find the Equation Using Point-Slope Formula (0,2) , (-1,-2)

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