math functions 8th grade

Question

Terry and Shaquan went to the fair. The cost to get into the fair is $5 and food and ride tickets cost $0.50 each. The equation y=.5x+5 represents this function where y is the total cost and x is the number of tickets purchases. If Terry buys 15 tickets and Shaquan buys 21 tickets, how much more money does Shaquan spend at the fair?

Answer 1

.5(21)+5 = 10.5+5 = $15.5 spent by Shaquan

.5(15)+5 = 7.5+5 = $12.5 spent byTerry

15.5-12.5 = $3 more spent by Shaquan than by Terry