Question

Oceanside bike rental shop charges of 12 dollar fixed fee plus 9 dollars an hour for renting a bike. Sally paid 48 dollars to rent a bike. How many hours did she pay to have the bike checked out?

Answer 1

Step-by-step explanation:

If h is the number of hours Sally rented the bike then she paid 12 dollars fixed fee plus 9*h.

Which means that she paid 12+9*h.

However she paid 48 dollars which means:

$12 + (9 \times h) = 48 \\ 9 \times h = 48 - 12 \\ 9 \times h = 36 \\ 9 \times h = 9 \times 4 \\ h = 4$

Which means that Sallly rented the bike for 4 hours