Linear graphs make straight lines. Non-linear graphs make thins like parabolas, hyperbolas, and ellipses
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Linear describes a relationship that exhibits a straight line when plotted on a graph, for example. Non liner is any thing other than a straight line.
You can measure things with a linear scale. Practically impossible with a non-linear scale.
Linear is a straight line and non linear could be a curve or anything but a straight line
Nonlinear do not satisfy the superposition principle. Linear problems, as implied, do.
A linear scale is a scale with equal divisions for equal vales, for example a ruler. A non linear scale is where the relationship between the variables is not directly proportional.