Ellie left Riverside California driving her motorhome north on Interstate 15 towards Salt Lake City at a speed of 64 miles per hour Half an hour later Israel left Riverside in his car on the same route as Ellie driving 72 miles per hour Solve the system 64y 72x y x 1 A for x to find out how long it will take Israel to catch up to Ellie B What is the value of y the number of hours Ellie will have driven before Israel catches up to her