Texas Instruments TITANIUM TI-89 User Manual

Page 376

3D Graphing

376

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.

– 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.”