Luis and Raul are riding their bicycles to the beach from their respective homes. Luis proposes that they leave their respective homes at the same time and plan to arrive at the beach at the same time. The diagram shows Luis's
position at two points during his ride to the beach. Write an equation in slope-intercept form to represent Luis's ride
from his house to the beach. If Raul lives 5 miles closer to the beach than Luis, at what speed must Raul ride for the
plan to work?