Lewis wants to acquire at most 12 packages of baseball cards. some packages have 4 rookie cards and some have only 3. in all, there are at most 38 rookie cards.

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.