Casio FX-CG20 AU User Manual page 138

Example To solve the following simultaneous linear equations for
x
4
x
x
– 5
1 m Equation
2 1(SIMUL)
2(3)
3 ewbw-cw-bw
bwgwdwbw
-fwewbw-hw
4 1(SOLVE)
• 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 shows the solution ( x , y , z ) of a simultaneous
linear equation with three unknowns.
x x a a b b
1 1 1 1
y y = = a a b b
2 2 2 2
z z a a b b
3 3 3 3
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.
• The message "No Solution" appears if there is no solution. The message "Ma ERROR"
appears if a solution could not be found.
• The message "Infinitely Many Solutions" appears along with the formula if there are an
infinite number of solutions.
• After calculation is complete, you can press 1(REPEAT), change coefficient values, and
then re-calculate.
y z
+ – 2 = – 1
y z
+ 6 + 3 = 1
y z
+ 4 + = – 7
–1 –1
c c d d
1 1 1 1
c c d d
2 2 2 2
c c d d
3 3 3 3
4-2
x y z
, , and