Texas Instruments TI-82 Getting Started page 7

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I.2.2 Functions in a Graph Window: Once you have entered a function in the Y= screen of the TI-82,

just press GRAPH to see its graph. The ability to draw a graph contributes substantially to our ability to

solve problems.

For example, here is how to graph

4x.

First press Y= and delete anything that may be there by

or to any of the other lines and pressing CLEAR wherever necessary. Then,

moving with the arrow keys to

press (-) X,T, MATH 3 + 4 X,T, to enter the function (as in Figure I.11).

with the cursor on the top line

Now press GRAPH and the TI-82 changes to a window with the graph of

(Figure I.12).

While the TI-82 is calculating coordinates for a plot, it displays a busy indicator at the top right of the

graph window.

Technology Tip: If you would like to see a function in the Y= menu and its graph in a graph window, both

at the same time, open the MODE menu, move the cursor down to the last line, and select Split screen. Your

TI-82's screen is now divided horizontally (see Figure I.11), with an upper graph window and a lower

window that can display the home screen or an editing screen. The split screen is also useful when you need

to do some calculations as you trace along a graph. For now, restore the TI-82 to FullScreen.

Your graph window may look like the one in Figure I.12 or it may be different. Because the graph of

extends infinitely far left and right and also infinitely far up and down, the TI-82 can display

only a piece of the actual graph. This displayed rectangular part is called a viewing window. You can easily

change the viewing window to enhance your investigation of a graph.

−10

Figure I.11: Split screen: Y= below

Figure I.12: Graph of

The viewing window in Figure I.12 shows the part of the graph that extends horizontally from

to 10

and vertically from

to 10. Press WINDOW to see information about your viewing window. Figure I.13

shows the WINDOW screen that corresponds to the viewing window in Figure I.12. This is the standard

viewing window for the TI-82.

Figure I.13: Standard WINDOW

Technology Guide

Graphing

I-7