Modern video buys Blu-ray disc with an invoice price of $30,200 the terms of the cell is 2/15 N/30 what is the net amount due on the order if the bill is paid by the 10th day

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?