The phone company Ringular 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 310 minutes, the monthly cost will be $145.5. If the customer uses 740 minutes, the monthly cost will be $296. A) Find an equation in the form y = mx + b, where a is the number of monthly minutes used and y is the total monthly cost of the Ringular plan. Answer: y = B) Use your equation to find the total monthly cost if 644 minutes are used. Answer: If 644 minutes are used, the total cost will be dollars.

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