Find the Equation Using Point-Slope Formula (3,2) , (9,3)

$(3, 2)$ , $(9, 3)$

Step 1

Find the slope of the line between $(3, 2)$ and $(9, 3)$ 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.

$m = \frac{3 - (2)}{9 - (3)}$

Simplify.

Simplify the numerator.

Multiply $- 1$ by $2$ .

$m = \frac{3 - 2}{9 - (3)}$

Subtract $2$ from $3$ .

$m = \frac{1}{9 - (3)}$

Simplify the denominator.

Multiply $- 1$ by $3$ .

$m = \frac{1}{9 - 3}$

Subtract $3$ from $9$ .

$m = \frac{1}{6}$

Step 2

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

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

Step 3

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

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

Step 4

Solve for $y$ .

Simplify $\frac{1}{6} \cdot (x - 3)$ .

Rewrite.

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

Simplify by adding zeros.

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

Apply the distributive property.

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

Combine $\frac{1}{6}$ and $x$ .

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

Cancel the common factor of $3$ .

Factor $3$ out of $6$ .

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

Factor $3$ out of $- 3$ .

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

Cancel the common factor.

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

Rewrite the expression.

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

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

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

Move the negative in front of the fraction.

$y - 2 = \frac{x}{6} - \frac{1}{2}$

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

Add $2$ to both sides of the equation.

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

To write $2$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

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

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

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

Combine the numerators over the common denominator.

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

Simplify the numerator.

Multiply $2$ by $2$ .

$y = \frac{x}{6} + \frac{- 1 + 4}{2}$

Add $- 1$ and $4$ .

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

Step 5

Reorder terms.

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

Step 6

List the equation in different forms.

Slope-intercept form:

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

Point-slope form:

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

Step 7

Find the Equation Using Point-Slope Formula (3,2) , (9,3)

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