Use the y-intercept formula: y=mx+b
Plug in one of the points for x and y
Using that, solve for either x or y
So on one galon of gas car A would travel 33 1/3 miles, while car B would travel 29 1/3 miles. Answer: Car A
A: 400 / 12 = 33 1/3
B: 440 / 15 = 29 1/3