Oceanside Bike Rental Shop charges $15.00 plus $9.00 per hour for renting a bike. Dan paid $51.00 to

Oceanside Bike Rental Shop charges $15.00 plus $9.00 per hour for renting a bike. Dan paid $51.00 to rent a bike. How many hours was he hiking for?

Set up the cost equation C(h) where h is the number of hours needed to rent the bike:
C(h) = Cost per hour * h + rental charge

Using our given numbers in the problem, we have:
C(h) = 9h + 15

The problem asks for h, when C(h) = 51.
9h + 15 = 51

To solve for h, we plug this equation into our search engine and we get:
h = 4