A stereo system is bought for $1200 and sold eight years later for $400. Find the depreciation equation. then find the value after the first five years

Question

the first answer must be in y=mx+/-b form. the second answer for the value after the first five years of ownership must be a dollar amount. please help!!

Answer 1

y= 1200 - ((1200-400)/8)x  (1200-400)/8 represents the difference in price divided by the years.

 

y= 1200 - 100x

 

substitute 5 for x

 

y= 1200 - 100(5)

 

y=700