HP 40gs User Manual page 218

hp40g+.book Page 36 Friday, December 9, 2005 1:03 AM
14-36
L1=2L1+L2
1 1 3
– –
0 2 2
ENTER
Reduction Result
2 0 4
– –
0 2 2
then press ENTER. The following is then written to the
Equation Writer:
(x = −2) AND (y = −1)
Example 2
Type:
(2·X+Y+Z=1)AND(X+Y+2·Z=1)AND(X+2·Y+Z=4)
Then, invoke LINSOLVE and type the unknowns:
X AND Y AND Z
and press the ENTER key.
The following result is produced if you are in Step-by-step
mode (CFG, etc.):
L2=2L2−L1
2 1 1 1 –
1 1 2 1 –
1 2 1 4 –
ENTER
L3=2L3−L1
2 1 1 1 –
0 1 3 1 –
1 2 1 4 –
and so on until, finally:
Reduction Result
8 0 0 4
0 8 0 – 20
0 0 8 – 4 –
Computer Algebra System (CAS)