If the values of f(x) for different values of x is given, it is possible to determine if the function is linear or non-linear by calculating the average rate of change between any two values of f(x).

For x = x1 and x = x2, the average rate of change between x1 and x2 is `(f(x2) - f(x1))/(x2 - x1)`

If the function f(x) is linear the rate of change between any two points should be the same. If this is not the case the function is non linear.

**For a linear function f(x), the average rate of change of f(x) between any two points is the same.**

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