The phone company A Fee and Fee has a monthly cellular plan where a customer pays a flat monthly fee and then a certain amount of money per minute used on the phone. If a customer uses 430 minutes, the monthly cost will be $239. If the customer uses 940 minutes, the monthly cost will be $494. A) Find an equation in the form y = m x + b , where x is the number of monthly minutes used and y is the total monthly cost of the A Fee and Fee plan. y =