# Chapter 3 Linear Systems and Matrices - Chapter Review - Page 226: 30

28

#### Work Step by Step

Using Cramer's rule to find the determinant of the matrices, we find: $$\det \begin{pmatrix}3&-5\\ 2&6\end{pmatrix} \\ 3\cdot \:6-\left(-5\right)\cdot \:2 \\ 28$$

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