College Algebra (11th Edition)

Published by Pearson
ISBN 10: 0321671791
ISBN 13: 978-0-32167-179-0

Chapter 5 - Section 5.2 - Matrix Solution of Linear Systems - 5.2 Exercises - Page 499: 1

Answer

$\begin{bmatrix}1& 4\\0 & -9 \end{bmatrix} $

Work Step by Step

We are given the matrix $\begin{bmatrix}1&4\\4&7\end{bmatrix}$. Perform the row operation as: $R_2=-4R_1+R_2$ Therefore, we can write: $\begin{bmatrix}1&4\\-4(1)+4 & -4(4)+7 \end{bmatrix} =\begin{bmatrix}1& 4\\0 & -9 \end{bmatrix} $
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