The phone company Ringular has a monthly plan where a customer pays a flat monthly fee, and then a set rate per minute. If a customer uses 450 minutes, the monthly cost will be $217. If the customer uses 680 minutes, the monthly cost will be $309. Find the equation of the plan in the form y = ma + b, where r is the number of monthly minutes used and y is the total monthly cost of the Ringular plan. If a customer uses 774 minutes, the total cost will be dollars.

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