1. Lets think about what this problem is telling us.
Tony bought a number of video games (n) at a fixed price (p)
The total of these games was $138.25
We can write this as an equation:
n*p = $138.25
Willy bought the same number of games as Tony (n)
As a follow-up to Steven G.'s answer, one of the most common forms for the equation of a line is the slope-intercept form, y=mx+b, where the 'm' is the slope in the form of a fraction (rise over run, or change in y over change in x) and b is the point on the y-axis where the line crosses, or...