Description: Sal graphs the following system of equations and solves it by looking for the intersection point: y = (7/5)x - 5 and y = (3/5)x - 1. Created by Sal Khan. So they say right over here, graph this system of equations and solve. So first let's graph this first equation. Or another way to think about it, when x is equal to 0, y is going to be negative 5.*Teacher Advisor is 100% free.