An example of  Non linear functions  

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i can't like draw a diagram but an equation whose graph is a straight line is called a linearfunction. A linear function has an equation that can be written in the form of y
mx  b. Equations whose graphs are not straight lines are called nonlinearfunctions. Some nonlinear functions have specific names. A quadraticfunction is nonlinear and has an equation in the form of y
ax2 bx  c,where a  0. Another nonlinear function is a cubic function. A cubic functionhas an equation in the form of y
ax3 bx2 cx  d, where a  0.