Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 3 Linear Systems and Matrices - 3.7 Evaluate Determinants and Apply Cramer's Rule - 3.7 Exercises - Skill Practice - Page 207: 5

Answer

25

Work Step by Step

We evaluate the determinant of the matrix using Cramer's rule, which is listed on page 203. Doing this, we find: $$\det \begin{pmatrix}-4&3\\ 1&-7\end{pmatrix} \\ \left(-4\right)\left(-7\right)-3\cdot \:1 \\ 25$$
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