10. a movie theater advertises that a family of two adults, one student, and one child between the ages of 3
and 8 can attend a movie for $15. an adult ticket costs as much as the combined cost of a student ticket
and a child ticket. you purchase 1 adult ticket, 4 student tickets, and 2 child tickets for $23.
a. formulate a system of 3 equations.
b. what is the price per ticket of each type of ticket?