Chapter 1.5, Problem 48E

In Exercises 42-49, the given matrix is the augmented matrix for a system of linear equations. Give the vector form for the general solution.

$\left[\begin{array}{ccccccc}1& 0& -1& 0& -1& -2& 0\\ 0& 1& 2& 0& 1& 2& 0\\ 0& 0& 0& 1& 1& 1& 0\end{array}\right]$