Please help me :) work out these problems with steps.

In a school 2/3 of the students study a language of those who study a language 2/5 study french

The coordinates of a, b, and c in the diagram are a(p,4), b(6,1), and c(9,q). which equation correctly relates p and q? hint: since is perpendicular to , the slope of × the slope of = -1. a. p - q = 7 b. q - p = 7 c. -q - p = 7 d. p + q = 7

Just tell me how to set up the equation.