Acar parks and has to pay one dollar per hour the first 2 hours then 3 dollars per hour after that and the max you can spend on the meter is 20 dollars what is the domain

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.