What will be the value of y?

How do you use the additive inverse to evaluate an expression that uses subtraction in a full sentence

Aparking lot is to be 400 feet wide and 370 feet deep. how many standard-sized cars fit in this lot considering a double-loaded (w4) two way traffic set up, an angle of 90° and a sw of 9’ 0’’? (do not consider handicapped parking spaces, and consider 15’ for turning aisles). show your work.

How to determine whether two known pairs of points are on the same line.