Let x1 represent the number of vehicles that use a season pass and let x2 represent the number of vehicles that do not.
The total number of vehicles is given by x1 + x2.
The receipts generated by the vehicles that use a season pass is 5x1 since each vehicle pays $5.00.
The receipts generated by the vehicles that do not use a season pass is 7.5x2 since each of these vehicles pays $7.50.
The total receipts for all vehicles is given by 5x1 + 7.5x2.
Number of Vehicles Constraint: x1 + x2 = 1,200 Total Receipts Constraint: 5x1 + 7.5x2 = $7,125 Non-negative Constraints: x1, x2 ≥ 0