Answer
4
Work Step by Step
We use Cramer's rule to find the determinant of the matrix. Doing this, we obtain:
$$\det \begin{pmatrix}3&5\\ 4&8\end{pmatrix}\\ 3\cdot \:8-5\cdot \:4 \\ 4$$
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 8 - Systems of Linear Equations and Problem Solving - 8.7 Determinants and Cramer's Rule - 8.7 Exercise Set - Page 557: 7
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