During summer vacation, you charge people $8 per hour for swimming lessons and a $20 registration fee. if you make $52 one day, how many hours did you spend teaching lessons?

At a local museum, the total price for one adult and one child is $11. mrs. smith paid for herself and her three children. she spent $19. record the system of equations to be solved and then find the price of an adult and child ticket using either elimination or substitution.