The phone company splint 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 290 minutes the monthly cost will be $98.50 if the customer uses 850 minutes the monthly cost will be $238.50 find any equation in the form Y equals MX plus be where X is the number of monthly minutes used and why is the total monthly of the splint plan