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6-8 Entering and Evaluating Equations

Editing and Clearing Equations

You can edit or clear an equation that you're typing. You can also edit or clear

equations saved in the equation list. However, you cannot edit or clear the two built-

in equations 2*2 lin. solve and 3*3 lin. solve. If you attempt to insert a equation

between the two built-in equations, the new equation will be inserted after 3*3 lin.

solve.

To edit an equation you're typing:

1. Press

Öor Õ to move the cursor allowing you to insert characters before

the cursor.

2. Move the cursor and press

 repeatedly to delete the unwanted number or

function. Pressing

 when the equation editing line is empty has no effect,

but pressing

 on an empty equation line causes the empty equation line

to be deleted. The display then shows the previous entry in the equation list.

3. Press  (or ) to save the equation in the equation list.

To edit a saved equation:

1. Display the desired equation, press Õ to activate the cursor at the beginning

of the equation or press

Ö to activate the cursor at the end of the

equation.(See "Displaying and Selecting Equations" above.)

2. When the cursor is active in the equation, you can edit the equation just like

you would when entering a new equation.

3. Press  (or  ) to save the edited equation in the equation list,

replacing the previous version.

Using menus while editing an equation:

1. When editing an equation, selecting a setting menu (such as 9,

8, or  ), will end the equation edit status.

2. When editing an equation, selecting an insert or view menu (such as

,

, , , , >,, 

and ), the equation will still be in edit mode after inserting the

item.

3. The menus

, , are disabled in equation mode.

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