Robert K. answered • 8d

Experienced Math Tutor Who Will Improve Both Understanding and Grades

Here is an alternative way to do it which I like.

For a perpendicular line change 2x - 7y to 7x + 2y and just say 7x + 2y = C

Now put in the point (-4,5) to find C

7(-4) + 2(5) = C

C = -18

7x + 2y = -18

In slope intercept form that would be y = (-7/2)x - 9