SOLUTION: An office printer is worth for $42,000 when it is 2 years old. When the printer is 6 years old, the value of the printer is $30,000. If the value of the printer decreases in a l

Algebra ->  Coordinate Systems and Linear Equations  -> Lessons -> SOLUTION: An office printer is worth for $42,000 when it is 2 years old. When the printer is 6 years old, the value of the printer is $30,000. If the value of the printer decreases in a l      Log On


   

Question 1108279: An office printer is worth for $42,000 when it is 2 years old. When the printer is 6 years old, the value of the printer is $30,000. If the value of the printer decreases in a linear fashion, determine the slope and give a practical interpretation of the slope.
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Youare given 2 points on a straight line
( 2, 42000 )
( 6, 30000 )
Plot time, +t+, on the horizontal axis
Plot value, +V+, on the vertical axis
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The slope is:
[ change in +V+ ] / [ change in +t+ ]
+m+=+%28+30000+-+42000+%29+%2F+%28+6+-+2+%29+
+m+=+-12000+%2F+4+
+m+=+-3000+ dollars/yr
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The slope tells you how fast the value is decreasing
It decreases $3,000 each year