### Home > AC > Chapter 10 > Lesson 10.2.4 > Problem10-85

10-85.

Find the equation of the line perpendicular to $y=-\frac{2}{3}-7$ that goes through the point $\left(-6,9\right)$.

Perpendicular lines have opposite, reciprocal slopes.

Substitute the given coordinates and the slope into the slope intercept form of a line to find $b$.

Rewrite the equation, substituting the values you just found for $m$ and $b$.