Texas Instruments TI-92 Getting Started page 14

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Graphing Technology Guide: TI-92
Press F3[TRACE] to enable the left and right directions to move the cursor along the function. The cursor is
no longer free-moving, but is now constrained to the function. The coordinates that are displayed belong to points on
the function's graph, so the y-coordinate is the calculated value of the function at the corresponding x-coordinate.
Figure 5.36: TRACE Figure 5.37: Two functions
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Figure 5.38: y = –x + 4x and y = –.25x
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Y= and enter –.25x for y2, then press
Now plot a second function, y = –.25x , along with y = –x + 4x . Press
GRAPH to see both functions (Figure 5.38).
Notice that in Figure 5.37 there are check marks ✓ to the left of both y1 and y2. This means that both functions will
be graphed. In the Y= screen, move the cursor onto y1 and press F4[ ✓ ]. The check mark left of y1 should disappear
(Figure 5.39). Now press GRAPH and see that only y2 is plotted (Figure 5.40).
Figure 5.39: only y2 active
Figure 5.40: Graph of y = –.25x
Many different functions can be stored in the Y= list and any combination of them may be graphed simultaneously.
You can make a function active or inactive for graphing by pressing F4 when the function is highlighted to add a
check mark (activate) or remove the check mark (deactivate). Now go back to the Y= screen and do what is needed
in order to graph y1 but not y2.
Now activate both functions so that both graphs are plotted. Press F3[TRACE] and the cursor appears first on the
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+ 4x because it is higher up on the Y= list. You know that the cursor is on this function, y1, because
graph of y = –x
of the numeral 1 that is displayed in the upper right corner of the screen. Press the up or down direction to
move the cursor vertically to the graph of y = –.25x. Now the numeral 2 is shown in the upper right corner of the
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