Find the Equation Using Point-Slope Formula (0,4) , (8,0)

$(0, 4)$ , $(8, 0)$

Step 1

Find the slope of the line between $(0, 4)$ and $(8, 0)$ 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.

$m = \frac{0 - (4)}{8 - (0)}$

Simplify.

Simplify the numerator.

Multiply $- 1$ by $4$ .

$m = \frac{0 - 4}{8 - (0)}$

Subtract $4$ from $0$ .

$m = \frac{- 4}{8 - (0)}$

Simplify the denominator.

Multiply $- 1$ by $0$ .

$m = \frac{- 4}{8 + 0}$

Add $8$ and $0$ .

$m = \frac{- 4}{8}$

Reduce the expression by cancelling the common factors.

Cancel the common factor of $- 4$ and $8$ .

Factor $4$ out of $- 4$ .

$m = \frac{4 (- 1)}{8}$

Cancel the common factors.

Factor $4$ out of $8$ .

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

Cancel the common factor.

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

Rewrite the expression.

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

Move the negative in front of the fraction.

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

Step 2

Use the slope $- \frac{1}{2}$ and a given point $(0, 4)$ 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 $m = \frac{y_{2} - y_{1}}{x_{2} - x_{1}}$ .

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

Step 3

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

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

Step 4

Solve for $y$ .

Simplify $- \frac{1}{2} \cdot (x + 0)$ .

Add $x$ and $0$ .

$y - 4 = - \frac{1}{2} \cdot x$

Combine $x$ and $\frac{1}{2}$ .

$y - 4 = - \frac{x}{2}$

Add $4$ to both sides of the equation.

$y = - \frac{x}{2} + 4$

Step 5

Reorder terms.

$y = - (\frac{1}{2} x) + 4$

Step 6

Remove parentheses.

$y = - \frac{1}{2} x + 4$

Step 7

List the equation in different forms.

Slope-intercept form:

$y = - \frac{1}{2} x + 4$

Point-slope form:

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

Step 8

Find the Equation Using Point-Slope Formula (0,4) , (8,0)

Related Questions

Support LCMGCF.com by disabling your adblocker.