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)
4
Move the tracer and find another
intersection.
y =
2
x -
5 and
y =
7
intersect at (6,7).
*
5
Solve the inequalities.
The solution to the “double”
inequality -1
≤
2
x -
5
≤
7
con-
sists of all values of
x
in be-
tween, and including, 2 and 6
(i.e.,
x
≥
2
and
x
≤
6). The so-
lution is 2
≤
x
≤
6.
○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
7-2
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.
2
2nd F
CALC
HB1.DocC.
98.10.1, 11:39 AM
5