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6–8 Entering and Evaluating Equations
To edit an equation you're typing:
1.
Press
b
repeatedly until you delete the unwanted number or function.
If you're typing a decimal number and the "_" digit–entry cursor is on,
b
deletes only the rightmost character. If you delete all characters in the number,
the calculator switches back to the "
¾
" equation–entry cursor.
If the "
¾
" equation–entry cursor is on, pressing
b
deletes the entire rightmost
number or function.
2. Retype the rest of the equation.
3. Press
(or
) to save the equation in the equation list.
To edit a saved equation:
1.
Display the desired equation. (See "Displaying and Selecting Equations"
above.)
2. Press
b
(once only) to start editing the equation. The "
¾
" equation–entry
cursor appears at the end of the equation. Nothing is deleted from the
equation.
3. Use
b
to edit the equation as described above.
4. Press
(or
) to save the edited equation in the equation list,
replacing the previous version.
To clear an equation you're typing:
Press
{c
then press {
&
}. The display goes back to the previous entry in
the equation list.
To clear a saved equation:
1.
Display the desired equation. (See "Displaying and Selecting Equations"
above.)
2. Press
{c
. The display shows the previous entry in the equation list.
To clear
all equations, clear them one at a time: scroll through the equation list until
you come to
  ! !
, press
, then press
{c
repeatedly as
each equation is displayed until you see
  ! !
.
Example: Editing an Equation.
Remove 25 in the equation from the previous example.