Electrical service costs $8 per month plus $0.10 per kilowatt

Electrical Rates Electrical service costs $8 per month plus $0.10 per kilowatt-hour of electricity used. (Assume that a partial kilowatt-hour is not rounded up.)

(a) If the resident of an apartment uses 650 kilowatt hours in 1 month, what is the charge?

(b) Write an equation in slope-intercept form that gives the cost C of using x kilowatt-hours in 1 month.

(c) If the monthly electrical bill for the apartment's resident is $43, how many kilowatt-hours were used?