You can get to the graph screen through the APPS key or directly from the keyboard.

What you see there depends on several things:

• The Graph MODE
• The Y= screen contents
• The WINDOW settings
• The GRAPH FORMATS settings:

The GRAPH FORMATS menu is on the Tools (F1) menu. On the TI-92+, it's also diamond F.

• Coordinates gives you a choice of RECT, POLAR, or OFF. It determines what numbers are displayed when you move the cursor on the screen.
• Graph Order is SEQ or SIMUL. If you have several graphs on the same axes, the calculator will draw them in order or all at once.
• Grid ON puts dots on the screen at points corresponding to the tick-marks on the axes. (That spacing is determined on the WINDOW screen.)
• Axes ON displays the x- and y-axes (if they're visible in the WINDOW.) In 3D mode you have a third option, BOX, which draws a box with edges parallel to the axes around the graph.
• Leading Cursor ON puts a blinking cursor at the point being drawn. This is useful in Parametric and Polar modes, when graphs often cross themselves.
• Labels ON puts labels on the axes. This is most useful in 3D mode, when you often want to rotate the image.

• ZoomBox lets you draw a box on the screen with the cursor. Put the cursor at one and then the opposite corner of your box and hit ENTER. The boxed area expands to fill the graphing screen. The 2nd key makes the cursor move faster on the GRAPH screen.
• ZoomIn and ZoomOut do exactly what you think. SetFactors determines the amount of magnification.
• ZoomDec puts the origin at the center of the screen and gives each pixel x- and y-coordinates which are integer multiples of 0.1.
• ZoomSqr puts the same scales on the x- and y-axes, so that circles are round and squares are square.
• ZoomStd sets the WINDOW values to their defaults: x- and y-coordinates vary from -10 to 10, tick marks appear at intervals of 1, and the resolution (how often, in pixels, the calculator calculates coordinates) is 2.
• ZoomTrig optimizes the axes for graphing trigonometric functions.
• ZoomInt optimizes the axes for graphing integer-valued functions. This is normally useful for graphing sequences.
• ZoomData adjusts the window to show all the data plots.
• ZoomFit adjusts the y-axis so that the graph doesn't disappear off the top or bottom edge.
• Memory lets you store and recall various WINDOW settings.

The Trace command introduces a cursor which stays on the graph. Unless you've turned Coordinates to OFF, the coordinates of the cursor's location show at the bottom of the screen. Moving the cursor up or down will shift it from graph to graph (if you have more than one on the screen.) A number in the upper right corner shows which graph you're on. Pressing ENTER while you're tracing moves the graph so that the point the cursor is on is at the center of the screen.
The 2nd key makes the cursor move faster on the GRAPH screen.

The x- and y-coordinates of the cursor are stored in the system variables xc and yc. You can use these values on the HOME screen.
 

Regraph does what you think.
 

The Math menu answers a variety of mathematical questions about the graph. For example, it will draw tangent lines and give their equations. Not all its features are available in each graph mode.

One useful feature finds the intersection of two curves.
First you have to tell the calculator which two curves you're interested in.
Then you have to put the cursor to the left of your first intersection point, hit ENTER, and then move it to the right of the point and hit ENTER again.
You have to repeat the procedure for any other intersection points.
The 2nd key makes the cursor move faster on the GRAPH screen.

The Draw and Pen menus let you add items you create to the picture. If you Regraph, the additions disappear.
The 2nd key makes the cursor move faster on the GRAPH screen.

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