Find the Equation Using Point-Slope Formula (-2,0) , (0,4)

$(- 2, 0)$ , $(0, 4)$

Step 1

Find the slope of the line between $(- 2, 0)$ and $(0, 4)$ 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.

$m = \frac{4 - (0)}{0 - (- 2)}$

Simplify.

Reduce the expression by cancelling the common factors.

Cancel the common factor of $4 - (0)$ and $0 - (- 2)$ .

Rewrite $4$ as $- 1 (- 4)$ .

$m = \frac{- 1 \cdot - 4 - (0)}{0 - (- 2)}$

Factor $- 1$ out of $- 1 (- 4) - (0)$ .

$m = \frac{- 1 (- 4 + 0)}{0 - (- 2)}$

Reorder terms.

$m = \frac{- 1 (- 4 + 0)}{0 - 2 \cdot - 1}$

Factor $2$ out of $- 1 (- 4 + 0)$ .

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

Cancel the common factors.

Factor $2$ out of $0$ .

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

Factor $2$ out of $- 2 \cdot - 1$ .

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

Factor $2$ out of $2 (0) + 2 (- - 1)$ .

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

Cancel the common factor.

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

Rewrite the expression.

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

Add $- 2$ and $0$ .

$m = \frac{- 1 \cdot - 2}{0 + 1}$

Simplify the denominator.

Multiply $- 1$ by $- 1$ .

$m = \frac{- 1 \cdot - 2}{0 + 1}$

Add $0$ and $1$ .

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

Simplify the expression.

Multiply $- 1$ by $- 2$ .

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

Divide $2$ by $1$ .

$m = 2$

Step 2

Use the slope $2$ and a given point $(- 2, 0)$ 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 $m = \frac{y_{2} - y_{1}}{x_{2} - x_{1}}$ .

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

Step 3

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

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

Step 4

Solve for $y$ .

Add $y$ and $0$ .

$y = 2 \cdot (x + 2)$

Simplify $2 \cdot (x + 2)$ .

Apply the distributive property.

$y = 2 x + 2 \cdot 2$

Multiply $2$ by $2$ .

$y = 2 x + 4$

Step 5

List the equation in different forms.

Slope-intercept form:

$y = 2 x + 4$

Point-slope form:

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

Step 6

Find the Equation Using Point-Slope Formula (-2,0) , (0,4)

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