As far as I've learnt, non-linear functions have to be of a degree greater than 1 (i.e, x^2, x^3, etc). However, an inverse variation problem, usually is in the form: y = k/x, where k is our constant. A function, in this form, still gives us a graph like the one demonstrated, even with a degree of 1.
I know this is a pretty basic question, but I don't really understand why this happens.
Thank you for any help.
AB6