Sharp EL-9600c, EL-9400 Graphing Solution Region of Inequalities, 1-1 1-2, Example, x 2 + y ≥

EL-9650/9600c/9450/9400 Graphing Calculator

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

x 2 + 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 Display Notes

1-1

1-2

(When using EL-9650/9600c)	(When using EL-9650/9600c)
*Use either pen touch or cursor to operate.

Rewrite the inequalities so that the left-hand side is y.

Enter y = 12-x for Y1 and y = 4 - x 2 for Y2.

Y= a/b 1 — X//T/n

x + 2y ≤ 1 ➞ y ≤	1-x
	2

x 2+y ≥ 4 ➞ y ≥ 4 - x 2

2 ENTER * 4 — X/ /T/n x2

1-3Set the shade and view the solution	Y2 ≤ y ≤ Y1
region.

2nd F DRAW G *

— —

*

GRAPH

1

*

—

*

2-1Set the display area (window) to : -9 < x < 3, -6 < y < 5.

WINDOW

ENTER

(-) 9

(-) 6

ENTER 3

ENTER 5

ENTER

ENTER

7-4