A small business buys a computer for $4600. After 4 years the value of the computer is expected to be $200. uses linear depreciation to assess the value of the computer at a given time.

Assuming the relation between V and t is V=mt+b, where t has the unit of year

According to the description: t=0, V=4600

So b=4600, V=mt+4600

Also, when t=4, V=200

So 200=4m+4600, -4400=4m, m=-1100

Therefore V=4600-1100t

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