Answer
$$-6$$
Work Step by Step
Using Cramer's rule to find the determinant, we obtain:
$$\det \begin{pmatrix}-4&5\\ 2&-1\end{pmatrix} \\ \left(-4\right)\left(-1\right)-5\cdot \:2 \\ -6$$
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 - Chapter Test - Page 227: 24
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