Determining+whether+a+function+is+linear+or+non-linear

Nonlinear functions- do not have constant rates of change, they are not straight lines linear- have a cnstant rate of change Parabola- the u-shape of a nonlinear function(quadratic)

Example-  y=mx+b =y=(rate od change*x)+y-intercept quadratic function-described by an equation of the form y=ax²+bx+c, where a =/0 cubic function- described by an equation of the form y=ax^3+bx²+cx+d, where a =/0    