Excel Solver-Non linear systems of equations

I've always used Mathcad in the past for this and am trying to figure it out in Excel. So my question is very basic.

I don't understand how the format of the solver inputs (cells) can be used to set up a system of equations.

Can anyone point me to a basic example? The only examples I can find are very simple financial optimizations.


Confused.

Any help would be appreciated.