## Algebra 2 (1st Edition)

$y-13=-9(x-8)$
This form is known as point-slope form which means we substitute our coordinates and the given slope, $m$ into the formula, $y-y_1=m(x-x_1)$ where $(x_1,y_1)$ is the point. $(8,13)$ is the point, $m=-9$ $y-13=-9(x-8)$