The Hydro water department has a monthly service charge of $14.40 and a volume charge of $1.10 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 = 1.1x + 14.40

If the Johnson family used 200 ft3 less water this month than last month, then they can expect

Question

The Hydro water department has a monthly service charge of $14.40 and a volume charge of $1.10 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 = 1.1x + 14.40

If the Johnson family used 200 ft3 less water this month than last month, then they can expect

anonymous · Answer

$2.20 less

anonymous · Answer

the service charge will stay the same no matter what so even if they use less water the $14.40 wont matter and since they used 200 less cubic feet of water then you take the $1.10 @100 cubic feet which would equal $2.20@200 cubic feet.