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Linear system solution

Linear system solution

Linear system solution

Good afternoon everybody,
I have a very simple problem: I can't solve a standard 4x4 linear system, using the Given/Find command. Every time I try to run the calculations, it always returns me the classic error message "The variable is undefined", thus I'm quite sure that everithing is well defined, obviouvsly except for the four constants I have to find. I've done this kind of calculations houndreds of times but something like this never happened before. I hope my error isn't too stupid! Thanks for everyone will help me, have a nice day.
P.S. It's the first time I write here, I sincerely hope to have respected all the rules of netiquette and of the forum.

RE: Linear system solution

Where are c.1 or c.3 or c.4 defined ?
I see c.2 defined early in the document.
Do you have to put in estimated values to start?
Am I missing something?

RE: Linear system solution

Where is z defined ?

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