Texas Instruments TITANIUM TI-89 - Manual (Page 376)

3D Graphing 376
Exploring the Graph Exploring the Graph Exploring the Graph Exploring the Graph
From the Graph screen, you can:
• Trace the equation.
• Use the „
Zoom toolbar menu to zoom in or out on a portion of the graph. Some of
the menu items are dimmed because they are not available for 3D graphs.
• Use the ‡
Math toolbar menu to evaluate the equation at a specified point. Only
1:Value is available for 3D graphs.
You can also evaluate z(x,y) while tracing. Type the x value and press ¸; then type
the y value and press ¸.
5. Change the graph format if necessary.
ƒ
9
– or -
8 Í
Note: To help you see the orientation of
3D graphs, turn on Axes and Labels .
6. Graph the selected equations
( 8 %).
Note: Before displaying the graph, the
screen shows the “percent evaluated.”