Suzette ran and biked for a total of 34 mi in 3.5 h. her average running speed was 6 mph and her average biking speed was 12.5 mph. let x = total hours suzette ran. let y = total hours suzette biked. use substitution to solve for x and y. show your work. check your solution.
a)how many hours did suzette run?
b) how many hours did she bike?

me, i am having a hard time grasping this concept.