## Equation Editor

To graph a function, the equation must be entered into the calculator.
Pressing

brings up a window where ten equations may be entered. Though only
eight equations will show on the screen, scrolling using the cursor
keys reveals the other two equations.

An equation is deleted using the cursor to select the unwanted equation
and pressing .

**Note:** Press
to type the variable *x*.

Press
to type a leading negative sign.

Press
to type a subtraction symbol.
Any character in an equation can be deleted. Highlight the character
and press .

A character can be inserted in an equation. Highlight the entry after
which a character is to be inserted. Press .
The character is inserted in front of the highlighted character.