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 160 minutes, the monthly cost will be $102. If the customer uses 520 minutes, the monthly cost will be $282.  Find an equation in the form y=mx+b, where x is the number of monthly minutes used and y is the total monthly cost of the Splint plan.

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