SOLUTION: A printer costs $960 new and is expected to be worth $140 after six years. What will it be worth after four years?

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: A printer costs $960 new and is expected to be worth $140 after six years. What will it be worth after four years?      Log On


   

Question 1072549: A printer costs $960 new and is expected to be worth $140 after six years. What will it be worth after four years?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
This is a straight line relation, and the slope
does not change
slope = [ change in cost ] / [ time in yrs ]
+%28+140+-+960+%29+%2F+%28+6+-+0+%29+
+%28+-820+%29+%2F6+=+-136.667+
Since the slope doesn't change, I can say:
Let +v+ = value after 4 yrs
+-136.667+=+%28+v+-+960+%29+%2F+%28+4+-+0+%29+
+v+-+960+=+-546.667+
+v+=+413.333+
The printer will be worth $413.33 in 4 yrs
---------------------------------------
Check:
I can also say:
+%28+140+-+413.333+%29+%2F+%28+6+-+4+%29+=+-136.667+
+-273.333%2F2+=+-136.667+
+-136.667+=+-136.667+
OK
Definitely check my math