EL-9600/9400 Graphing Calculator
Notes
Step & Key Operation
(When using EL-9600)
*Use either pen touch or cursor to operate.
Display
(When using EL-9600)
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2
-
1
Enter
y =
3(4
-
2
x
) for Y1 and
y =
5
- x
for Y2.
*
(7 times)
(4 times)
*
2
-
2
View the graph.
2
-
3
Access the Set Shade screen.
*
*
2
-
4
Set up the shading.
Since the inequality being
solved is Y1
≥
Y2, the solu-
tion is where the graph of Y1
is “on the top” and Y2 is “on
the bottom.”
*
*
*
2
-
5
View the shaded region.
2
-
6
Find where the graphs intersect and
solve the inequality.
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 - 2
x
)
≥
5
- x
is all values
of
x
such that
x
≤
1.4.
*
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.
7-1
GRAPH
Y=
DEL
—
—
—
—
2
G
1
5
ENTER
2nd F CALC
2nd F DRAW
GRAPH
X
/
/
T
/
n
HB1.DocC.
98.10.1, 11:39 AM
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