One refrigerator sells for $700 and uses $85 worth of electricity per year. A second refrigerator is

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One refrigerator sells for $700 and uses $85 worth of electricity per year. A second refrigerator is $100 more expensive but costs only $25 per year to run. Assuming that there are no repair costs, the costs to run the refrigerators over a 10-yr period are given by the following system of equations. Here, y represents the total cost in dollars, and x is time in years.

y = 700 + 85x

y = 800 + 25x

In how many years will the costs for the two refrigerators be equal? What are the equivalent costs at that time?

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College Algebra

ISBN: 978-0134697024

12th edition

Authors: Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels

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