The phone company A Fee and Fee has a monthly cellular plan where a customer pays a flat fee plus an amount per minute. If a customer uses 460 minutes, the monthly cost will be $168. If the customer uses 710 minutes, the monthly cost will be $243.

A) Find an equation in the form
y = mx + b ,where x is the number of minutes used per month and y is the total monthly cost of the A Fee and Fee plan.


y =

B) Use your equation to find the total monthly cost if 858 minutes are used.

If 858 minutes are used, the total cost will be blank
dollars.