Formula for straight line depreciation is as follows:
Depreciation = (Cost of asset - salvage value) / useful life of asset
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A linear relationship means that the slope of the line is proportional, which means that the line is straight. In contrast to the linear realtionship, the non-linear relationship's slope is not proportional and the line will curved and not straight. Formula of calculating the slope is the difference of y divided by the difference of x.
Y=mX+b
(y2 - y1) / (x2 - x1)
The standard expression for a straight line graph is y = ax + b
It is the formula for a straight line with a slope of 3.6.