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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.

Hope this helps.

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

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. :)