Sharp EL-9900 User Manual

1. Press 

@ ,.

The substitution feature

screen will appear. The

equation on which the cursor

pointer is located and its

variables are displayed on

the right of the screen.

If variables (characters) contain no values, the graph is not

drawn.

If independent memories A to C contain any numeric values,

the graph is drawn based on these values.

* If the equation (in this example, Y1) on which the cursor is

located contains no variables, the substitution feature screen

will not appear.

• 22 kinds of variables (characters), A to Z except for R, T, X, and Y can be used for

the substitution feature.

• Up to seven variables (characters) can be used for one equation. (If the equation

contains more than seven variables (characters), up to seven characters from the

top of the equation are determined as variables and subsequent characters are

ignored.)

• If you attempt to execute an equation containing no variables, the substitution

feature becomes invalid and the error message, “NO VARIABLE”, appears on the

screen.

• To input the equation, there are the following two methods after 

Y has been

pressed. After the equation has been input, the same operations apply to subse-

quent steps.

Substitute numeric values under the conditions that “Y1 = AX

2

 

+

BX 

+

 C” and “Y2 = AX” have been input.

Equation Entry screen

The cursor pointer is located at

Y1. Drawing of both graphs Y1

and Y2 is valid.