Texas Instruments TI-89 Voyage 200, User Manual

Page: 376 / 1008

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.”