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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.





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?

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Answer:

1. A    y = 25x + 500

Which equation represents the cost of the high-efficiency washing machine over a given number of years?  

2. B     y = 30x + 400

Which equation represents the cost of the standard washing machine over a given number of years?  

3. D     20

After how many years of use would the washing machines cost the same amount?  

4. B      standard machine

Which washing machine would be the more practical purchase if kept for 9 years?