Calculator User Manual

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 1003MATH.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
à
Extrapolate Editor
-
Œ
/
&
Using the interpolate
à
extrapolate editor, you can interpolate or extrapolate a value linearly,
given two known pairs and the x-value or y-value of the unknown pair.
Display the interpolate
à
extrapolate editor.
Enter real values for the first known pair
(
x1
,
y1
). The values can be expressions.
-
Œ
/
&
3
b
5
b
Enter values for the second known pair
(
x2
,
y2
).
4
b
4
b
Enter a value for either the
x
value or the
y
value of the unknown pair.
If necessary, move the cursor to the value
for which you want to solve (
x
or
y
).
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
à
extrapolate 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).