Bill orders pictures from a photograph ER each picture causes 7.50.A one time shipping fee of $4.25 is added to the cost of the order. The total cost of todd's order before tax is $86.75.How Many pictures did todd order?

Sophia wrote an equation to represent the revenue of a movie theater for one day. she let x represent the number of child tickets sold and y represents the nunver of adult tickets sold. if a child ticket cost $4, an adult ticket cost $6, and the total revenue for the daybwas $420, which equation could sophia use to represent the number of chikd and adult tickets that were sold?