A homeowner's electric bill for the month was $155.80 for 1,900 kilowatt-hours of
energy used. If no electricity is used there is no charge for service. Which
equation represents the cost in dollars of the electricity, y, and the number of
kilowatt-hours of energy used, x?
A. y = 12.2x
B. y = 0.082x
C. y = 0.12%
D. y = 8.2x