Question 4 unsaved the price of a movie ticket is $8 for an adult and $5 for a child. the following equation represents the total cost, c, of buying x number of adult tickets and y number of child tickets. c=8x+5y which equation can be used to find the number of child tickets purchased if you know the total cost and the number of adult tickets purchased? question 4 options: y=c−8x5 y=c+8x5 y=5c−8x y=c−40x