Find the Equation Using Point-Slope Formula (-1,3) , (6,4)

$(- 1, 3)$ , $(6, 4)$

Step 1

Find the slope of the line between $(- 1, 3)$ and $(6, 4)$ 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.

$m = \frac{4 - (3)}{6 - (- 1)}$

Simplify.

Simplify the numerator.

Multiply $- 1$ by $3$ .

$m = \frac{4 - 3}{6 - (- 1)}$

Subtract $3$ from $4$ .

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

Simplify the denominator.

Multiply $- 1$ by $- 1$ .

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

Add $6$ and $1$ .

$m = \frac{1}{7}$

Step 2

Use the slope $\frac{1}{7}$ and a given point $(- 1, 3)$ 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 $m = \frac{y_{2} - y_{1}}{x_{2} - x_{1}}$ .

$y - (3) = \frac{1}{7} \cdot (x - (- 1))$

Step 3

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

$y - 3 = \frac{1}{7} \cdot (x + 1)$

Step 4

Solve for $y$ .

Simplify $\frac{1}{7} \cdot (x + 1)$ .

Rewrite.

$y - 3 = 0 + 0 + \frac{1}{7} \cdot (x + 1)$

Simplify by adding zeros.

$y - 3 = \frac{1}{7} \cdot (x + 1)$

Apply the distributive property.

$y - 3 = \frac{1}{7} x + \frac{1}{7} \cdot 1$

Combine $\frac{1}{7}$ and $x$ .

$y - 3 = \frac{x}{7} + \frac{1}{7} \cdot 1$

Multiply $\frac{1}{7}$ by $1$ .

$y - 3 = \frac{x}{7} + \frac{1}{7}$

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

Add $3$ to both sides of the equation.

$y = \frac{x}{7} + \frac{1}{7} + 3$

To write $3$ as a fraction with a common denominator, multiply by $\frac{7}{7}$ .

$y = \frac{x}{7} + \frac{1}{7} + 3 \cdot \frac{7}{7}$

Combine $3$ and $\frac{7}{7}$ .

$y = \frac{x}{7} + \frac{1}{7} + \frac{3 \cdot 7}{7}$

Combine the numerators over the common denominator.

$y = \frac{x}{7} + \frac{1 + 3 \cdot 7}{7}$

Simplify the numerator.

Multiply $3$ by $7$ .

$y = \frac{x}{7} + \frac{1 + 21}{7}$

Add $1$ and $21$ .

$y = \frac{x}{7} + \frac{22}{7}$

Step 5

Reorder terms.

$y = \frac{1}{7} x + \frac{22}{7}$

Step 6

List the equation in different forms.

Slope-intercept form:

$y = \frac{1}{7} x + \frac{22}{7}$

Point-slope form:

$y - 3 = \frac{1}{7} \cdot (x + 1)$

Step 7

Find the Equation Using Point-Slope Formula (-1,3) , (6,4)

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