Amarket value went up 125.32 on monday, 13.75 on tuesday, it decreased -32.18 on wednesday, -12.76 on thursday, what's the value after a lost on friday?

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?