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:
$$\det \begin{pmatrix}-4&3\\ 1&-7\end{pmatrix} \\ \left(-4\right)\left(-7\right)-3\cdot \:1 \\ 25$$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
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
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