A linear equation in n-dimensional space is of the form
a1x1 + a2x2 + ... + anxn + c = 0 where the ai are numerical constants and the xi are variables. The equation represents a straight line in n-dimensional space.
A non-linear equation is one in which one or more of the xi have a power other than 1. The equation will represent a curve.
A linear system is one in which you will get the same result if you change an input by the same amount - from whatever starting level. Otherwise the system is non-linear.
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linear
This is non-linear
6 is neither linear nor non-linear. It is just a number.
Linear means anything that forms a straight line. Nonlinear means the opposite. Something that doesn't form a straight line.
Nonlinear