A linear function is a function with degree 1 (the higher exponent of the variable x is 1). Examples of linear functions are:
equation: y = x + 1
graph of a linear function:
(The equation for this graph is y = 2x + 2)
Table of a linear function:
A non-linear function is any function with degree different from 1.
Examples of non-linear functions:
Equation: y = x² + 2x + 1
graph of a non-linear function:
(the equation for this graph is y = 2x² + x + 1)
Table of a non-linear function: