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{{ printedBook.courseTrack.name }} {{ printedBook.name }} A non-linear function is any function that is **not linear**. Since the definition of a linear function is that is has a constant rate of change, a non-linear function doesn't have a constant rate of change.

The functions above are all examples of non-linear function since there rate of change vary. In other words, the graph of a non-linear function is not a line.