Answer: None of the above
Explanation:
Let x represent the number of kilowatt-hours used for a month.
Let y represent the total cost of x kilowatt-hours used for a month.
The electric utility company determines the monthly bill for a residential customer by adding an energy charge of 9.37 cents per kilowatt-hour to its base charge of $16.39 per month. It means that the total cost of kilowatt-hours used for a month would be
y = 9.37x + 16.39
Looking at the given options, none of them is correct.