Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 10 - Review - Exercises - Page 771: 79

Answer

$(\frac{1}{5}, \frac{9}{5})$

Work Step by Step

Step 1. Define the following matrices based on the given system of equations: $\begin{array} \\D=\\ \end{array} \begin{bmatrix} 2&7\\ 6&16\end{bmatrix}, \begin{array} \\D_x=\\ \end{array} \begin{bmatrix}13&7\\ 30&16 \end{bmatrix}, \begin{array} \\D_y=\\ \end{array} \begin{bmatrix}2&13\\ 6&30 \end{bmatrix},$ Step 2. Calculate the determinants of the above matrices: $|D|=2\times16-7\times6=-10$, $|D_x|=13\times16-7\times30=-2$, and $|D_y|=2\times30-13\times6=-18$ Step 3. Use the Cramer's Rule: $x=\frac{|D_x|}{|D|}=\frac{1}{5}$, $y=\frac{|D_y|}{|D|}=\frac{9}{5}$ Step 4. Conclusion: the solution to the system is $(\frac{1}{5}, \frac{9}{5})$
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