Not all functions are expressed as equations. Here is a graph
of a function g. The equation is not given, but you can still use
function notation to express the outputs for various inputs.
![Not all functions are expressed as equations Here is a graph of a function g The equation is not given but you can still use function notation to express the ou class=](https://us-static.z-dn.net/files/d83/6c0863d810f8236ee42fd1766ca2689b.png)