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Thank you guys, I thought as much, but you know, when doing it alone you doubt yourself. I have learnt something today : a system with three variables and two equations will NOT yield precise values for the variables, except by inserting the infinite number of all possible solutions. Thanx. Will be back soon.
Substituting for y will all solutions, but unfortunately this post is too small to contain them.
I am so sorry Bobbym . The other z is positive.
I have edited the system. the other z is positive. Sorry guys.
Now substituting any value into x will yield a solution to the system.
You made a mistake. It should be
Since there are three variables and only two equations, there will be infinitely many solutions.
5x +2y - z =9