# Entering and graphing expressions

**April 14th, 2010** by admin

An expression is a group of numbers, operators, variables, and functions or a combination of these elements. Now, go back to the new equation view, to plot a function simply enter: y=x^2 and tap the done button. If the expression contains an error, a message under the expression will appear informing about it.

If you unlock the advanced features you can graph implicit equations like x^2+y^2-5=0 or simply x^2+y^2-5 and Quick graph will assume that it is equals to zero.

You can use trigonometric functions, inequalities, and a set of prebuilt functions that we will explore in depth in subsequent sections.

October 06, 2011 at 4:52 pm, Alex said:

Is there a way to trace the graphs of implicit relations? When I tap and hold, I can trace the graphs of functions, but when I try the same thing with x^2-xy+y^2=7 for example, I get nothing.