Alocal hamburger shop sold a combined total of 577 hamburgers and cheeseburgers on sunday. there were 73 fewer cheeseburgers sold than hamburgers. how many hamburgers were sold on sunday?

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?