College Algebra (10th Edition)

Published by Pearson
ISBN 10: 0321979478
ISBN 13: 978-0-32197-947-6

Chapter 8 - Section 8.2 - Systems of Linear Equations: Matrices - 8.2 Assess Your Understanding - Page 570: 23

Answer

The system represented by the augmented matrix is $\left\{\begin{array}{llll} x & -3y & +2z & =-6\\ 2x & -5y & +3z & =-4\\ -3x & -6y & +4z & =6 \end{array}\right.$ Performing the row operations, $\rightarrow\left[\begin{array}{rrr|r} {1}&{-3}&{2}&{-6}\\ {0}&{1}&{-1}&{8}\\ {0}&{-15}&{10}&{-12}\end{array}\right]$

Work Step by Step

The system represented by the augmented matrix is $\left\{\begin{array}{llll} x & -3y & +2z & =-6\\ 2x & -5y & +3z & =-4\\ -3x & -6y & +4z & =6 \end{array}\right.$ Performing the row operations, $R_{2}=-2r_{1}+r_{2}$ $R_{3}=3r_{1}+r_{3}$ $\left[\begin{array}{rrr|r} {1}&{-3}&{2}&{-6}\\ {2}&{-5}&{3}&{-4}\\ {-3}&{-6}&{4}&{6}\end{array}\right]\rightarrow$ $\rightarrow\left[\begin{array}{ccc|c} {1} &{-3} &{2} &{-6}\\ {-2(1)+2} &{-2(-3)-5} &{-2(2)+3}&{-2(-6)-4}\\ {3(1)-3}&{3(-3)-6}&{3(2)+4}&{3(-6)+6}\end{array}\right]$ $\rightarrow\left[\begin{array}{ccc|c} {1}&{-3}&{2}&{-6}\\ {0}&{1}&{-1}&{8}\\ {0}&{-15}&{10}&{-12}\end{array}\right]$
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