Chapter 10 - Section 10.3 - Matrices and Systems of Linear Equations - 10.3 Exercises - Page 710: 24

$\left[\begin{array}{llll} 1 & -3 & 2 & -1\\ 0 & 1 & 1 & -1\\ 0 & 0 & -3 & 3 \end{array}\right]$

$\left[\begin{array}{llll} 1 & -3 & 2 & -1\\ 0 & 1 & 1 & -1\\ 0-2(0) & 2-2(1) & -1-2(1) & 1-2(-1) \end{array}\right]$ $\left[\begin{array}{llll} 1 & -3 & 2 & -1\\ 0 & 1 & 1 & -1\\ 0 & 0 & -3 & 3 \end{array}\right]$