A music band came to town. The amphitheater filled all 50,000 seats at two-level pricing. Level 1 tickets are $150 each, and level 2 tickets are $250 each. The amphitheater made $125,000 in ticket sales. The system of equations that models this scenario is:

x + y = 50,000
150x + 250y = 125,000

What do the x and y represent in the system?

x represents the number of level 2 tickets; y represents the number of level 1 tickets
x represents the cost of level 1 tickets; y represents the cost of level 2 tickets
x represents the number of level 1 tickets; y represents the number of level 2 tickets
x represents the cost of level 2 tickets; y represents the cost of level 1 tickets