Posted by Penny on Friday, July 13, 2012 at 1:12pm.
You have two points: (5,7000) and (10,2000)
the two-point equation for the line is thus
(y-7000)/(x-5) = (2000-7000)/(10-5)
or, after rearranging things a bit:
y = -1000x + 12000
That is, the value started at $12,000, and depreciates $1000/year
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