Jim purchased 9 tickets to a concert and spent 65 He purchased some children s tickets and adult tickets The children s tickets cost 5 each and the adult tickets cost 10 each Which system of equation below will determine the number of adult tickets a and the number child tickets c he purchased a c 10 10a Sc 65 a c 585 a c 9 10a 5c 65 a c 9 Sa Sc 74 a c 9 Question 19 3 points Solve the 3 Variable System of Equations 2x 5y 3z 10 3x y 4z 8 5x 2y 72 12 7 1 3 7 1 3 7 1 3 7 1 3