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Notes
EL-9900 Graphing Calculator
3-3
3-1
Delete the input matrices for future
use.
The 1 is the x coordinate, the 2
the y coordinate, and the 3 the
z coordinate of the solution
point.
(x, y, z)=(1, 2, 3)
The system of equations can
be expressed as
Enter the constants on the right side
of the equal sign into matrix C (3x1).
2-1
Enter a 3x 3 matrix B.
2-2
Some square matrices have
no inverse and will generate
error statements when calcu-
lating the inverse.
Exit the matrix editor and find the
inverse of the square matrix B.
8-2
(repeatedly)
The calculator can execute calculation of inverse matrix and matrix
multiplication. A system of linear equations can be solved easily using the
Matrix feature.
-0.17 0.83 - 0.5
0.5 -0.5 0.5
0.17 0.17 -0.5
B
-1
=
3-2
x
y
z
1 2 1
2 1 -1
1 1 -2
8
1
-3
=
Let each matrix B, X, C :
BX = C
B
-1
BX = B
-1
C (multiply both
sides by B
-1
)
I = B
-1
(B
-1
B = I, identity matrix)
X = B
-1
C
Calculate B
-1
C.
MATRIX
MATRIX
MATRIX
MATRIX
MATRIX
23 3
1
2
2
1
11
1
1
2
A
2
B33
1
81 3
A2
A3
C
2
2nd F
QUIT
2nd F
OPTION
2nd F
ENTER
ENTERx
-1
X
CL
ENTER
ENTER
ENTER
ENTER ENTER
ENTER
ENTER
ENTER
ENTER ENTER
ENTER
ENTER
ENTER ENTER
ENTER
ENTER
ENTER
CL
2nd F
2nd F
x
-1
QUIT
(
-
)
(
-
)
(
-
)
B
2nd F
2nd F
2nd F
2nd F
2nd F