Texas Instruments TI-86 - Manual (Page 65)

Chapter 3: Math, Calculus, and Test Operations
53
03MATH.DOC TI-86, Chap 3, US English Bob Fedorisko Revised: 02/13/01 2:19 PM Printed: 02/13/01 3:00 PM Page 53 of 10 03MATH.DOC TI-86, Chap 3, US English Bob Fedorisko Revised: 02/13/01 2:19 PM Printed: 02/13/01 3:00 PM Page 53 of 10
The Interpolate àExtrapolate Editor - Œ / &
Using the interpolate
àextrapolate editor, you can interpolate or extrapolate a value linearly,
given two known pairs and the x-value or y-value of the unknown pair.
ᕡ Display the interpolate àextrapolate editor.
ᕢ Enter real values for the first known pair
(x1,y1). The values can be expressions.
- Π/ &
3 b 5 b
ᕣ Enter values for the second known pair
(x2,y2).
4 b 4 b
ᕤ Enter a value for either the x value or the
y value of the unknown pair.
ᕥ If necessary, move the cursor to the value
for which you want to solve ( x or y ).
ᕦ Select SOLVE .
1 b
$ or #
*
The result is interpolated or extrapolated and displayed; the variables x and y are not
changed. A solid square in the first column indicates the interpolated or extrapolated value.
After solving for a value, you can continue to use the interpolate
àextrapolate editor.
To interpolate y from the
home screen, select inter(
from the CATALOG, and then
enter inter(
x1 , y1 , x2 , y2 , x ) .
To interpolate x from the
home screen, enter
inter(
y1 , x1 , y2 , x2 , y ) .
You can store individual
values with the
X key
(Chapter 2).