Procedure, Result screen – Casio SERIES FX-9860G User Manual
Page 169
20070201
4-1-2
Simultaneous Linear Equations
Example
To solve the following simultaneous linear equations for
x
,
y
, and
z
4
x
+
y
– 2
z
= – 1
x
+ 6
y
+ 3
z
= 1
– 5
x
+ 4
y
+
z
= – 7
Procedure
1 m EQUA
2 1(SIML)
2(3)
3 ewbw-cw-bw
bwgwdwbw
-fwewbw-hw
4 1(SOLV)
Result Screen
# Internal calculations are performed using a 15-
digit mantissa, but results are displayed using
a 10-digit mantissa and a 2-digit exponent.
# Simultaneous linear equations are solved
by inverting the matrix containing the
coeffi cients of the equations. For example,
the following shows the solution (
x
1
,
x
2
,
x
3
)
of a simultaneous linear equation with three
unknowns.
Because of this, precision is reduced as the
value of the determinant approaches zero. Also,
simultaneous equations with three or more
unknowns may take a very long time to solve.
# An error occurs if the calculator is unable to fi nd
a solution.
# After calculation is complete, you can press
1 (REPT), change coeffi cient values, and then
re-calculate.
–1
=
x
1
x
2
x
3
a
1
b
1
c
1
a
2
b
2
c
2
a
3
b
3
c
3
d
1
d
2
d
3