Texas Instruments TI-89 Manual Book page 353

Recalling Previously
Entered Equations
Tip: You can specify how
many equations are retained.
From the Numeric Solver,
press ƒ and select 9:Format
( or use TI-89: ¥ Í
TI-92 Plus: ¥ F). Then select
a number from 1 through 11.
Saving Equations
for Future Use
Note: An equation variable
has an data type, as
EXPR
shown on the MEMORY and
screens.
VAR-LINK
Opening a Saved
Equation
336 Chapter 19: Numeric Solver
Your most recently entered equations (up to 11 with the default
setting) are retained in memory. To recall one of these equations:
1. From the Numeric Solver
screen, press ‡.
A dialog box displays the most
recently entered equation.
2. Select an equation.
¦
To select the displayed
equation, press ¸.
¦
To select a different
equation, press B to display
a list. Then select the one
you want.
3. Press ¸.
Because the number of equations that you can recall with ‡
limited, a particular equation may not be retained indefinitely.
To store the current equation for future
use, save it to a variable.
1. From the Numeric Solver screen,
press ƒ and select
2. Specify a folder and a variable
name for the equation.
3. Press ¸ twice.
To open a previously saved equation
variable:
1. From the Numeric Solver screen,
press ƒ and select
2. Select the applicable folder and
equation variable.
3. Press ¸.
Variable eqn contains the current
Only unique equations are
listed. If you re-enter the
same equation 5 times, it
appears only once.
2:Save Copy As.
1:Open .
equation; it always appears
alphabetically in the list.
is
Eqns