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The table below models the cost, y, of using a high-
efficiency washing machine and a standard washing
machine over x number of years.
Number of
Years
1
2
3
High-
Efficiency
Cost ($)
525
550
575
Standard
Cost ($)
430
460
490
Which equation represents the cost of the high-
efficiency washing machine over a given number of
years?
Which equation represents the cost of the standard
washing machine over a given number of years?
After how many years of use would the washing
machines cost the same amount?
Which washing machine would be the more practical
purchase if kept for 9 years?
