The table models the cost, why, of using a high efficiency washing machine and a standard washing machine over X number for years. 1. Which equation represents the cost of the high-efficiency washing machine over a given number of years.

y = 25x + 500
y = 25x + 525
y = 50x + 500
y = 50x + 525

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

y = 25x + 430
y = 30x + 400
y = 60x + 400
y = 60x + 430

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

9 years
10 years
19 years
20 years

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

-high efficiency machine
-standard machine
-costs would be the same