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?