Find the Equation Using Point-Slope Formula (-6,-1) , (-8,-4)

$(- 6, - 1)$ , $(- 8, - 4)$

Step 1

Find the slope of the line between $(- 6, - 1)$ and $(- 8, - 4)$ 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.

$m = \frac{- 4 - (- 1)}{- 8 - (- 6)}$

Simplify.

Simplify the numerator.

Multiply $- 1$ by $- 1$ .

$m = \frac{- 4 + 1}{- 8 - (- 6)}$

Add $- 4$ and $1$ .

$m = \frac{- 3}{- 8 - (- 6)}$

Simplify the denominator.

Multiply $- 1$ by $- 6$ .

$m = \frac{- 3}{- 8 + 6}$

Add $- 8$ and $6$ .

$m = \frac{- 3}{- 2}$

Dividing two negative values results in a positive value.

$m = \frac{3}{2}$

Step 2

Use the slope $\frac{3}{2}$ and a given point $(- 6, - 1)$ 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 $m = \frac{y_{2} - y_{1}}{x_{2} - x_{1}}$ .

$y - (- 1) = \frac{3}{2} \cdot (x - (- 6))$

Step 3

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

$y + 1 = \frac{3}{2} \cdot (x + 6)$

Step 4

Solve for $y$ .

Simplify $\frac{3}{2} \cdot (x + 6)$ .

Rewrite.

$y + 1 = 0 + 0 + \frac{3}{2} \cdot (x + 6)$

Simplify by adding zeros.

$y + 1 = \frac{3}{2} \cdot (x + 6)$

Apply the distributive property.

$y + 1 = \frac{3}{2} x + \frac{3}{2} \cdot 6$

Combine $\frac{3}{2}$ and $x$ .

$y + 1 = \frac{3 x}{2} + \frac{3}{2} \cdot 6$

Cancel the common factor of $2$ .

Factor $2$ out of $6$ .

$y + 1 = \frac{3 x}{2} + \frac{3}{2} \cdot (2 (3))$

Cancel the common factor.

$y + 1 = \frac{3 x}{2} + \frac{3}{2} \cdot (2 \cdot 3)$

Rewrite the expression.

$y + 1 = \frac{3 x}{2} + 3 \cdot 3$

Multiply $3$ by $3$ .

$y + 1 = \frac{3 x}{2} + 9$

Move all terms not containing $y$ to the right side of the equation.

Subtract $1$ from both sides of the equation.

$y = \frac{3 x}{2} + 9 - 1$

Subtract $1$ from $9$ .

$y = \frac{3 x}{2} + 8$

Step 5

Reorder terms.

$y = \frac{3}{2} x + 8$

Step 6

List the equation in different forms.

Slope-intercept form:

$y = \frac{3}{2} x + 8$

Point-slope form:

$y + 1 = \frac{3}{2} \cdot (x + 6)$

Step 7

Find the Equation Using Point-Slope Formula (-6,-1) , (-8,-4)

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