Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 11 - Systems of Equations and Inequalities - 11.2 Systems of Linear Equations: Matrices - 11.2 Assess Your Understanding - Page 731: 58

Answer

Inconsistent (no solution)

Work Step by Step

We are given the system of equations: $\begin{cases} 3x-2y+2z=6\\ 7x-3y+2z=-1\\ 2x-3y+4z=0 \end{cases}$ Write the augmented matrix: $\begin{bmatrix} 3&-2&2&|&6\\7&-3&2&|&-1\\2&-3&4&|&0\end{bmatrix}$ Perform row operations to bring the matrix to the reduced row echelon form: $R_1=-r_3+r_1$ $\begin{bmatrix} 1&1&-2&|&6\\7&-3&2&|&-1\\2&-3&4&|&0\end{bmatrix}$ $R_2=-7r_1+r_2$ $\begin{bmatrix}1&1&-2&|&6\\0&-10&16&|&-43\\2&-3&4&|&0\end{bmatrix}$ $R_3=-2r_3+r_2$ $\begin{bmatrix}1&1&-2&|&6\\0&-10&16&|&-43\\0&-5&8&|&-12\end{bmatrix}$ $R_3=-2r_3+r_2$ $\begin{bmatrix}1&1&-2&|&6\\0&-10&16&|&-43\\0&0&0&|&-19\end{bmatrix}$ $R_2=-\dfrac{1}{10}r_2$ $\begin{bmatrix}1&1&-2&|&6\\0&1&-1.6&|&4.3\\0&0&0&|&-19\end{bmatrix}$ As the last row contains only zeros at the left of the vertical bar and a nonzero element at its right side, the system is inconsistent; therefore it has no solution.
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