## Equation Editor

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

brings up a window where up to 99 equations may be entered.

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
.

Characters can be inserted in an equation. Highlight the entry after which the characters are to be
inserted. Press
.