An airport has two long-term parking lots. The cost to park, y, in each lot for x days is shown in the tables. Lot A Lot B Days Days Parked Cost Parked Cost - $16 1 $6 2 $20 2 $12 3 $24 3 $18 4 $28 4 $24 A system of linear equations can be used to determine on which day the cost to park is the same for both lots. One of the equations in the system is y = 6x. What is the other equation in the system