144
CHAPTER 5
[4 rrow EF] Used to calculate the reduced row-echelon form of the matrix.
<Example>
To calculate the reduced row-echelon form of mat A: :
Entry: rrowEF mat A
Answer:
The use of rrow EF makes it possible to solve simulta-
neous equations.
To solve the following simultaneous equations, follow these steps.
x + 2y – z = 3
2x – 3y + z = 0
3x – y – z = -2
• First, determine the coefficients of the matrix and make matrix B containing 3 rows
by 4 columns.
• Next, calculate the matrix B using rrow EF as shown below.
• As a result, the following solutions are obtained.
1 × x + 0 × y + 0 × z = 2 x = 2
0 × x + 1 × y + 0 × z = 3 y = 3
0 × x + 0 × y + 1 × z = 5 z = 5
• To solve simultaneous equations using rrow EF, a matrix containing the numbers of
variables and equations is required.
(3) Calculation using [ ]
• Next, the calculation using [ ] is explained.
Press
E
to open the [ ] menu.
Square brackets [ ] are provided on the matrix function screen "E:" to define a matrix
representation. By selecting sub-menu item 1 or 2, the matrix representation can be
copied onto the home screen.
< Example >
Used when creating a matrix directly from the standard function display screen.
Key operation to create
43
25
is as follows:
E
1
1
4
,
3 2
1
2
,
5
2
2
®
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EL-9650-(05)En (135-144) 8/1/00, 1:58 AM144
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