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Independent variables are the input value of a function (usually x) and dependent variables are the output value of the function (usually y).
variables
In optimization models, the formula for the objective function cell directly references decision variables cells. In complicated cases there may be intermediate calculations, and the logical relation between objective function and decision variables be indirect.
Straight line equations have two variables in the form of x and y
An alternating function is a function in which the interchange of two independent variables changes the sign of the dependent variable.