Chapter 6, Matrices and Determinants - Section 6.1 - Matrices and Systems of Linear Equations - 6.1 Exercises - Page 501: 24

\[ M= \left[ {\begin{array}{cc} 1 & -3 & 2 & - 1 \\ 0 & 1 & 1 & -1 \\ 0&0&-3&3\\ \end{array} } \right] \]

\[ M= \left[ {\begin{array}{cc} 1 & -3 & 2 & - 1 \\ 0 & 1 & 1 & -1 \\ 0&2&-1&1\\ \end{array} } \right] \] \[ M= \left[ {\begin{array}{cc} 1 & -3 & 2 & - 1 \\ 0 & 1 & 1 & -1 \\ 0-0&2-2&-1-2&1+2\\ \end{array} } \right] \] \[ M= \left[ {\begin{array}{cc} 1 & -3 & 2 & - 1 \\ 0 & 1 & 1 & -1 \\ 0&0&-3&3\\ \end{array} } \right] \]