lakeside bike rental shop charges a $15 flat fee and $9 dollar an hour for renting a bike. Eldritch Abomination, Cthulhu paid 96 dollars to rent a bike. How many hours did they pay to have the bike?

Answer 1

Let's define y as what the bike rental shop charges a customer, and x as the number of hours a customer rents a bike.

We can write the formula as:

y = 15 + 9x

Cthulhu (haha) paid $96 total, so we'll substitute that in for y and solve for x.

96 = 15 + 9x

Subtract 15 from both sides.

81 = 9x

Divide both sides by 9.

9 = x

Cthulhu paid to rent the bike for 9 hours.

Answer 2

96 - 15 = 81

81 / 9 = 9