Sharp EL-9650 Handbook page 30

Step & Key Operation
*Use either pen touch or cursor to operate.
2
1 Enter y = 3(4 - 2x) for Y1 and
-
y = 5 - x for Y2.
(7 times)
Y=
*
—
ENTER 5
*
2
2
View the graph.
-
GRAPH
2
3
Access the Set Shade screen.
-
2nd F DRAW G
*
1
*
2
4 Set up the shading.
-
— —
*
2
5
-
View the shaded region.
GRAPH
2
6
Find where the graphs intersect and
-
solve the inequality.
2
2nd F CALC
*
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-9650/9600c allows the solution region to be indicated visually
using the Shade feature. Also, the points of intersection can be obtained easily.
7-1
(4 times)
DEL
n
X/ /T/
—
* *
EL-9650/9600c Graphing Calculator
Display
Since the inequality being
solved is Y1
tion is where the graph of Y1
is "on the top" and Y2 is "on
the bottom."
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)
of x such that x
Notes
Y2, the solu-
5 - x is all values
1.4.