Northwest High School recently hosted its first basketball tournament of the year. Tickets were sold before the tournament and at the door. When reviewing the ticket sales, the pep club members realized they had sold a total of 743 tickets, and that 75 more tickets were purchased before the tournament than at the door. Which are good choices for variables that can be used to model the situation? Select ALL that apply. x = the total number of tickets sold y = tickets x = the number of tickets sold before the tournament y = the number of tickets sold at the door x = the total amount of money made