It can be thought of as a function that does not graph to a line when plotted. For example, y=4 or y=5x are linear. But y=x2 or y=x1/2 or y=ln(x) are not linear
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A scale that is nonlinear. ~
Nonlinear
Nonlinear can be only positive or only negative, or switch between the two over its domain.
yes
Linear means anything that forms a straight line. Nonlinear means the opposite. Something that doesn't form a straight line.