Algrebra II
posted by Maria .
In this word problem, I have to assume that it can be described by a linear function:
A photocopying machine purchased new for $4500 loses $900 in value each year.
a) Find the value of the machine after 18 months.
b) When will the book value be $1200?
Thank you for helping me with this.

Value=4500 900/12 * timeinMonths
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