Posted by **Penny** on Friday, July 13, 2012 at 1:12pm.

A boat is worth $7,000 when it is 5 years old and $2,000 when it is 10 years old. What is the slope intercept equation?

- algebra -
**Steve**, Friday, July 13, 2012 at 2:27pm
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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