What is the words that complete the definitions?

nonlinear equation: an equation whose graph is not a ____________ _____________.

nonlinear system of equations: two or more equations that are solved together, where at least one equation is _________ and the equations have at least ____ variables.

solution set of a nonlinear system of equations: all the x- and y-values that make all the equations in the system _______________ ; all the points where the graphs of all the equations in the system ____________ .