What are the differences of linear and non-linear equation?

Linear equations have a variable only to the first degree(something to the power of 1).
For example: 2x + 1 = 5 , 4y - 95 = 3y are linear equations.

Non-linear equation have a variable that has a second degree or greater.
For example: x2 + 3 = 19, 3x3 - 10 = 14 are non-linear equations.
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