Cost equations
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Cost equations are derived from historical cost data. Once a cost equation has been established, for example distinguishing the fixed and variable costs using the high/low method, it canbe used to estimate future costs.
Cost equations are assumed to have alinear function and therefore the equation of a straight line can be applied
y = a + bx
where:
y = dependent variable = total cost
x = independent variable = activity level
a = intercept on y-axis = fixed cost perperiod
b = gradient of the line = variable costper unit

