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 280 minutes, the monthly cost will be $127. If the customer uses 710 minutes, the monthly cost will be $277.50. A) 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 Ringular plan.
Added by Michelle T.
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The slope is the change in y divided by the change in x. In this case, the change in y is the change in cost ($277.50 - $127 = $150.50) and the change in x is the change in minutes (710 - 280 = 430). So, the slope is $150.50 / 430 = $0.35. Show more…
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