Texas Instruments TITANIUM TI-89 - Manual (Page 336)

Basic Function Graphing 336
2. As necessary, use D and C to select the function for the first point.
3. Set the first point. Either use A or B to move the cursor to the point or type its x
value.
4. Press ¸. A
+ marks the point.
5. If the second point is on a different function, use D and C to select the function.
6. Set the second point. (If you use the cursor to set the point, a line is drawn as you
move the cursor.)
Drawing a Tangent Line Drawing a Tangent Line Drawing a Tangent Line Drawing a Tangent Line
1. From the Graph screen, press ‡ and select
A:Tangent .
2. As necessary, use D and C to select the applicable function.
Note: To erase a drawn tangent line, press † (
ReGraph ).
7. Press ¸.
The distance between the two points is
displayed, along with the connecting line.
3. Set the tangent point. Either move the
cursor to the point or type its x value.
4. Press ¸.
The tangent line is drawn, and its
equation is displayed.