In first only normal time of functions skills are math kind of adding over 100 those have.

Hello arenaisi0,

A linear function is a graph that is a straight line. They follow this formula: y = f(x) = a + bx.

A non-linear function is, well, not a linear function. It is not straight.  An example is a quadratic function.

Here is the Unit if you need/want more help.

https://www.khanacademy.org/math/cc-eighth-grade-math/cc-8th-linear-equations-functions#linear-nonlinear-functions-tut

Hope this helps.

Linear functions are graphs that have straight lines only

*Edit it is spelled line(a)r, not liner

Non-linear functions are graphs that are not "lines." The definition of a line in mathematics refers a line(non-mathematical) that is straight. If you are a bit confused by this, think about it this way. The definition of a line in english is, well, a LINE. But the definition of a line in mathematics is a straight line(english). An example of a nonlinear function is a parabola. A parabola is a function that is a u shaped graph. A parabola with a contain a squared variable. An example of a parabola is y=x^2. A linear function would be like y=x+1. This function is straight and maintains the slope of 1. Which makes it linear.

Here is the link the intro about parabolas. Very simple stuff but useful. :)

https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:quadratic-functions-equations/x2f8bb11595b61c86:intro-parabolas/v/parabolas-intro

Hope this helps :)