Question

What is a nonlinear equation​

Answer 1

I hope this helps

'typically the behavior of nonlinear system of equations, which is a set of simultaneous equations in which the unknowns (or the unknown functions in the case of differential equations) appear as variables of a polynomial of degree higher than one or in the argument'

Answer 2

A system of nonlinear equations is a system of two or more equations in two or more variables containing at least one equation that is not liner