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 290 minutes, the monthly cost will be $180. If the customer uses 880 minutes, the monthly cost will be $475.

A) Find an equation in the form $\displaystyle {y}={m}{x}+{b},$ where $\displaystyle {x}$ is the number of monthly minutes used and $\displaystyle {y}$ is the total monthly of the Ringular plan.

Answer: $\displaystyle {y}=$
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B) Use your equation to find the total monthly cost if 703 minutes are used.

Answer: If 703 minutes are used, the total cost will be dollars.