hp40g+.book Page 36 Friday, December 9, 2005 1:03 AM

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

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Computer Algebra System (CAS)