SHARP EL-9400 VOLUME 1
Owner's Manual

EL-9600/9400 Graphing Calculator
Step & Key Operation
(When using EL-9600) *Use either pen touch or cursor to operate.

Display
(When using EL-9600)

Notes

2-1

Enter y = 3(4 - 2x) for Y1 and y = 5 - x for Y2.
Y=
ENTER

* *
5

(7 times) DEL (4 times)

�

X/ /T/n

2-2

View the graph.
GRAPH

2-3

Access the Set Shade screen.
2nd F DRAW

G

*

1

*

2-4

Set up the shading.
� �

*

*

�

*

Since the inequality being solved is Y1 � Y2, the solution is where the graph of Y1 is �on the top� and Y2 is �on the bottom.�

2-5

View the shaded region.
GRAPH

2-6

Find where the graphs intersect and solve the inequality.
2nd F CALC

2

*

The point of intersection is (1.4, 3.6). Since the shaded region is to the left of x = 1.4, the solution to the inequality 3(4 - 2x) � 5 - x is all values of x such that x � 1.4.

7-1

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Graphical solution methods not only offer instructive visualization of the solution process, but they can be applied to inequalities that are often difficult to solve algebraically. The EL-9600/9400 allows the solution region to be indicated visually using the Shade feature. Also, the points of intersection can be obtained easily.