The cost of renting a bike is $15 and you borrow the bike for 6 hours and have to pay a settee for each hour you borrow the bike. The cost to rent the bike per hour is represented by b. If you paid a total of $36 for the rental, how much does it cost to rent the bike per hour?

Three students, javier, sam, and corrine, participated in a fundraiser where people donated a certain amount of money per lap that the student ran. each student also had some initial donations that were collected before the run. the equations that represent each student's total donation, y, based on the number of laps ran, x, is shown below. match each equation with the correct rate of change for that student.