Sharp EL-9650 Handbook page 35

Step & Key Operation
(When using EL-9650/9600c)
*Use either pen touch or cursor to operate.
2
2
Use the cursor to check the position
-
of each point. (Zoom in as necessary).
or
GRAPH
2
3
-
Substitute points and confirm
whether they are in the solution
region.
-
( )
1
2
1 •
X
(Continuing key operations omitted.)
Graphical solution methods not only offer instructive visualization of the solution process,
but they can be applied to inequalities that are often very difficult to solve algebraically.
The EL-9650/9600c/9450/9400 allows the solution region to be indicated visually using
the Shading feature. Also, the free-moving tracer or Zoom-in feature will allow the
details to be checked visually.
EL-9650/9600c/9450/9400 Graphing Calculator
(When using EL-9650/9600c)
or or
+
• 6
...
8
Display
Points in the solution region
are (2.8, -1.4) and (-8, 4).
Points outside the solution
region are (-1.6, 1.8) and
(-2, -5).
.
(-1.6, 1.8): -1.6 + 2
This does not materialize.
.
(-2, -5): -2 + 2
This does not materialize.
.
(2.8, -1.4): 2.8 + 2
This materializes.
.
(-8, 4):
This materializes.
Notes
1.8 = 2
(-5) = -12
(-2) 2 + (-5) = -1
(-1.4) = 0
2
(2.8) + (-1.4) = 6.44
-8 + 2 4 = 0
(-8) 2 + 4 = 68
7-4