SOLUTION: An item costs $1300 has a scrap value of $100, and a useful life of six years. The linear equation relating book value and number of years is:

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The data given tells me two points on the linear relation
(,)
(,)
This is with ,the book value plotted on the y-axis
and , the number of years on the x-axis
says that when it's years old (brand new),
it's worth dollars
says that when it's years old, it's worth
dollars (scrap value)
The formula to use, in terms of B, and n is


multiply both sides by

multiply both sides by

answer
Try values of n = 1,2,3,4,5,6 to check this