SOLUTION: The average value of a certain type of automobile was $13,140 in 2007 and depreciated to $4740 in 2010. Let y be the average value of the automobile in the year x, where x = 0 repr

Algebra ->  Coordinate Systems and Linear Equations  -> Lessons -> SOLUTION: The average value of a certain type of automobile was $13,140 in 2007 and depreciated to $4740 in 2010. Let y be the average value of the automobile in the year x, where x = 0 repr      Log On


   

Question 1123253: The average value of a certain type of automobile was $13,140 in 2007 and depreciated to $4740 in 2010. Let y be the average value of the automobile in the year x, where x = 0 represents 2007. Write a linear equation that models the value of the automobile in terms of the year x.
I need help solving this.
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Description is of (x,y) points, (0, 13140) and (3, 4740).

y=mx%2Bb
b=y-mx

m=%284740-13140%29%2F%283%29
m=-2800

Since the x=0 point was given in description, for year 2007, b=13140.

highlight%28y=-2800x%2B13140%29