Solving systems of equations of TI-89

Agrophobic
Sat, 14 May 2005 12:20:32 +0000

… I forgot a equal sign… sorry

One more question–how can I tell which variable will have an infinite number of solution, so that I know how to express the other ones in terms of that variable?

Fro ex:

2x-y+z=-1
x+3y-2z=2
-5x+6y-5z=5

Using matrices I found that z can be any real #, so I expressed x and y in terms of z. Without doing matrices, how do I know z can have infnite solutions??

Thanls!!!