Graphing Solution Region Of Inequalities - Sharp EL-9650 Handbook

Graphing Solution Region of Inequalities

The solution region of an inequality consists of all points (a, b) such that when x = a, and y = b,
all inequalities are true.
Example
Check to see if given points are in the solution region of a system of inequalities.
1.
Graph the solution region of a system of inequalities:
x + 2y 1
2
x + y 4
2.
Which of the following points are within the solution region?
(-1.6, 1.8), (-2, -5), (2.8, -1.4), (-8,4)
Before
There may be differences in the results of calculations and graph plotting depending on the setting.
Starting
Return all settings to the default value and delete all data.
Step & Key Operation
(When using EL-9650/9600c)
*Use either pen touch or cursor to operate.
1
1
- Rewrite the inequalities so that the
left-hand side is y.
1
1-x
2
- Enter y = for Y1 and
2
2
y = 4 - x for Y2.
a /b
Y= 1 —
2
ENTER
*
1
3 Set the shade and view the solution
-
region.
G 1
2nd F DRAW
*
— —
*
GRAPH
2
1
Set the display area (window) to :
-
-9 < x < 3, -6 < y < 5.
-
( )
9
WINDOW ENTER
-
( )
6
ENTER
7-4
EL-9650/9600c/9450/9400 Graphing Calculator
(When using EL-9650/9600c)
n
X/ /T/
n
2
4 — x
X/ /T/
—
* *
3
ENTER
5
ENTER ENTER
Display
x + 2y
2
x +y
Y2 y
Notes
1-x
1
y
2
2
4 y 4 - x
Y1