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? Number of Years High- Efficiency Cost ($) Standard Cost ($) 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? 1 525 430 2 550 460 3 575 490