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)
= 0.75 , = 0 .75
8-5
2
-
2
Is |
x
+
y
| = |
x
| +|
y
|? Think about
this problem according to the cases
when
x
or
y
are positive or negative.
If
x
≥
0 and
y
≥
0
[e.g.; (
x, y
) = (2,7)]
If
x
≤
0 and
y
≥
0
[e.g.; (
x, y
) = (-2, 7)]
If
x
≥
0 and
y
≤
0
[e.g.; (
x, y
) = (2, -7)]
If
x
≤
0 and
y
≤
0
[e.g.; (
x, y
) = (-2, -7)]
|
x
+
y
| = |2 + 7| = 9
|
x
|+|
y
| = |2| + |7| = 9
➞
|
x
+
y
| = |
x
| + |
y
|.
|
x
+
y
| = |-2 + 7| = 5
|
x
|+|
y
| = |-2| + |7| = 9
➞
|
x
+
y
|
≠
|
x
| + |
y
|.
|
x
+
y
| = |2-7| = 5
|
x
|+|
y
| = |2| + |-7| = 9
➞
|
x
+
y
|
≠
|
x
| + |
y
|.
|
x
+
y
| = |-2-7| = 9
|
x
|+|
y
| = |-2| + |-7| = 9
○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
3
-
1
Evaluate . Evaluate .
3
-
2
Is |
x
/
y
| = |
x
|/|
y
|?
Think about this problem according
to the cases when
x
or
y
are positive
or negative.
If
x
≥
0 and
y
≥
0
[e.g.; (
x, y
) = (2,7)]
If
x
≤
0 and
y
≥
0
[e.g.; (
x, y
) = (-2, 7)]
If
x
≥
0 and
y
≤
0
[e.g.; (
x, y
) = (2, -7)]
If
x
≤
0 and
y
≤
0
[e.g.; (
x, y
) = (-2, -7)]
|
x
/
y
| = |2/7| = 2/7
|
x
|/|
y
| = |2| /|7| = 2/7
➞
|
x
/
y
| = |
x
| / |
y
|
|
x
/
y
| = |(-2)/7| = 2/7
|
x
|/|
y
| = |-2| /|7| = 2/7
➞
|
x
/
y
| = |
x
| / |
y
|
|
x
/
y
| = |2/(-7)| = 2/7
|
x
|/|
y
| = |2| /|-7| = 2/7
➞
|
x
/
y
| = |
x
| / |
y
|
|
x
/
y
| = |(-2)/-7| = 2/7
|
x
|/|
y
| = |-2| /|-7| = 2/7
➞
|
x
/
y
| = |
x
| / |
y
|
The statement is true for all
y
≠
0.
*
*
*
*
*
○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
The EL-9600/9400 shows absolute values with | | just as written on paper by
using the Equation editor. The nature of arithmetic of the absolute value can be
learned through arithmetical operations of absolute value functions.
6-9
1+3
6-9
1+3
6-9
1+3
6-9
1+3
6-9
1+3
6-9
1+3
➞
=
➞
|
x
+
y
| = |
x
| + |
y
|.
Therefore |
x
+
y
|=|
x
|+|
y
|when
x
≥
0 and
y
≥
0
,
and when
x
≤
0 and
y
≤
0.
CL
ENTER
a/b
MATH
ENTER
a/b
MATH
+
—
—
+
6
9
1
3
6
9
1
3
1
1
1
MATH
HB1.DocD.
98.10.1, 6:12 PM
5
