The local high school hosted a hockey tournament. Tickets were sold before the tournament and at the door. When reviewing the ticket sales, the director of the tournament realized that there were 80 more tickets purchased before the tournament than at the door. A total of 820 tickets were sold. Which statements about ticket sales are true? Check all that apply. The variable x could represent the total number of tickets sold. The variable x could represent the number of tickets sold before the tournament. The variable y could represent the number of tickets sold at the door. The variable y could represent the total value of tickets sold at the door. The system of equations that could represent this situation is x y = 820. X minus y = 80. The system of equations that could represent this situation is x minus y = 820. X y = 80.