The Hydro water department has a monthly service charge of $13.70 and a volume charge of $2.22 for every 100 cubic feet of water. The total monthly cost is equal to the service charge plus the charge for the volume used during the month. If we let x represent the number of cubic feet of water (in hundreds) and y represent the total monthly cost, then we have: total monthly cost = volume charge + service charge y = 2.22x + 13.70 If the Johnson family used 200 ft3 more water this month than last month, then they can expect