Find the Equation Using Point-Slope Formula (19,22) , (6,9)

$(19, 22)$ , $(6, 9)$

Step 1

Find the slope of the line between $(19, 22)$ and $(6, 9)$ 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.

$m = \frac{9 - (22)}{6 - (19)}$

Simplify.

Simplify the numerator.

Multiply $- 1$ by $22$ .

$m = \frac{9 - 22}{6 - (19)}$

Subtract $22$ from $9$ .

$m = \frac{- 13}{6 - (19)}$

Simplify the denominator.

Multiply $- 1$ by $19$ .

$m = \frac{- 13}{6 - 19}$

Subtract $19$ from $6$ .

$m = \frac{- 13}{- 13}$

Divide $- 13$ by $- 13$ .

$m = 1$

Step 2

Use the slope $1$ and a given point $(19, 22)$ 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 $m = \frac{y_{2} - y_{1}}{x_{2} - x_{1}}$ .

$y - (22) = 1 \cdot (x - (19))$

Step 3

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

$y - 22 = 1 \cdot (x - 19)$

Step 4

Solve for $y$ .

Multiply $x - 19$ by $1$ .

$y - 22 = x - 19$

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

Add $22$ to both sides of the equation.

$y = x - 19 + 22$

Add $- 19$ and $22$ .

$y = x + 3$

Step 5

List the equation in different forms.

Slope-intercept form:

$y = x + 3$

Point-slope form:

$y - 22 = 1 \cdot (x - 19)$

Step 6

Find the Equation Using Point-Slope Formula (19,22) , (6,9)

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