## Equation Editor

To graph a function, the equation must be entered into the calculator.
Press
to bring up the window where up to 99 equations may be entered.

An equation is deleted using the cursor to select the unwanted
equation and pressing
.
To enter another equation, press
until an empty y= appears.

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

Press to type a leading negative sign.

Press to type a subtraction symbol.

A equation can be selected or deselected by moving
the cursor to the equal sign of that equation and pressing
.
Deselected equations still exist but are not graphed.

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
.