Graphing normally involves the Y= screen for entering formulas,
                                         the WINDOW screen for determining which part of the graph to display, and
                                         the GRAPH screen to see the result.

You can also enter Graph x^2 or Graph f(x) (if you've defined the function f) on the command line of the HOME screen. The formula does not appear on the Y= screen, and the GRAPH screen uses the latest WINDOW settings.

What kind of thing you can graph depends on the graph MODE.

FUNCTION lets you draw graphs with equations like y = x².

PARAMETRIC lets you graph curves defined with parametric equations, like x = t², y = t³.

POLAR lets you draw graphs in polar coordinates, with equations like r = sin(theta).

SEQUENCE lets you plot points in a sequence, such as 10, 11, 11.1, 11.11, 11.111, ....
The sequence needs a formula like u_n = n² or a recursive formula like u₁ = 10, u_n+1 = u_n + 10^1-n.

3D lets you graph surfaces with equations like z = x² - y². It's pretty slow and somewhat limited.
You can also graph implicitly defined functions (like x² + y² = 4) in 3D graph mode. It's pretty slow and somewhat limited.

DIFF EQUATIONS displays graphical solutions to differential equations, like y' = 2t -3y².

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