The graph below represents c, the amount a phone company charges, based on m, the number of minutes the customer uses each month. If there are a maximum of 44,640 minutes in a month, which equation best represents the phone company’s monthly charges? A graph entitled Phone Company Charges has number of minutes on the x-axis and cost in dollars on the y-axis. The line has a positive slope and goes through (0, 15) and (40, 25).