How to find equation of a line passing through a given point and perpendicular to a given equation

Solve - pv + 40 < 65 for v solve 7w - 3r = 15 for r

Logan wants to know how many skateboards have defective parts. he inspects 20,000 skateboards and keeps track of the number of defects per board. use his probability distribution table to find the expected value for defects on a skateboard.

What is the difference between the equations of a vertical and a horizontal line?