Posted by **Jessica** on Tuesday, August 31, 2010 at 7:25pm.

A photocopying machine purchased new for $4500 loses $900 in value a each year.

a. Find the book value of the machine after 18 months.

b. When will the book value be $1200?

Assume that each situation can be decribed as a linear equation

HELP!!! I don't know how to set this up but I know the answer

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