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The rate of change of a function is found by taking the derivative of the function. The equation for the derivative gives the rate of change at any point. This method is used frequently in calculus.
The rate of change for the linear (not liner) function, y = 2x +/- 3 is 2.
rate of change
If the graph is a non-vertical straight line, then the rate of change is constant. If the line is curved, then the rate of change (slope) varies.
if a number can change randomly it is called a variable