Casio fx-9860G SD User Manual page 165

Example To solve the following simultaneous linear equations for
x
4 +
x
+ 6
x
– 5 + 4
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 coefficients
of the equations. For example, the following
x x
shows the solution ( ,
1
ous linear equation with three unknowns.
x a b
1 1 1
=
x a b
2 2 2
x a b
3 3 3
4-1-2
Simultaneous Linear Equations
y z
– 2 = – 1
y z
+ 3 = 1
y z
+ = – 7
x
, ) of a simultane-
2 3
–1
c d
1 1
c d
2 2
c d
3 3
20050401
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 find
a solution.
# After calculation is complete, you can press
1 (REPT), change coefficient values, and then
re-calculate.
x y z
, , and