Algebra 2 Common Core

Published by Prentice Hall
ISBN 10: 0133186024
ISBN 13: 978-0-13318-602-4

Chapter 12 - Matrices - 12-1 Adding and Subtracting Matrices - Practice and Problem-Solving Exercises - Page 768: 17

Answer

$x=-2, $ $y=3,$ and $z=1$

Work Step by Step

Operating on the corresponding elements, the given matrix equation, $ \begin{bmatrix} 2 & 2 \\ -1 & 6 \end{bmatrix} - \begin{bmatrix} 4 & -1 \\ 0 & 5 \end{bmatrix} = \begin{bmatrix} x & y \\ -1 & z \end{bmatrix} ,$ implies the following equations: \begin{align*} \begin{array}{cccc} 2-4=x &&2-(-1)=y && 6-5=z \end{array} .\end{align*} Simplifying the equations above results to \begin{align*} \begin{array}{cccc} -2=x &&2+1=y && 1=z \\ &&3=y \end{array} .\end{align*} Hence, $ x=-2, $ $y=3,$ and $z=1 $.
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