91Ó°ÊÓ

Show that the value of $\left|\begin{array}{ccc}-2& 3& 5\\ 0& -1& 4\\ 9& 7& 2\end{array}\right|$is the same whether you use expansion by minors or diagonals.

Find the value of each determinant.

5.

Use Cramer’s Rule to solve each system of equations.

$\frac{1}{2}r-\frac{2}{3}s=2\frac{1}{3}$

$\frac{3}{5}r+\frac{4}{5}s=-10$

Find the value of each determinant.

6.

$\left|\begin{array}{ccc}1& 3& -2\\ 7& 0& 4\\ -3& 5& -1\end{array}\right|$

Name the property illustrated by each equation.

60. $7+\left(w+5\right)=\left(7+w\right)+5$

BASIC SKILL

Use cross products to solve each proportion.

60. $\frac{4}{20}=\frac{1}{m}$

PREREQUISITE SKILL Graph each set of ordered pairs on a coordinate plane.60.$\{(−3,3),(1,3),(4,2),(−1,−5)\}$

Find the product, if possible.

$\left(\begin{array}{cc}2& 4\\  -2& 3\end{array}\right)\left(\begin{array}{cc}3& 9\\  -1& 2\end{array}\right)$

Find the product, if possible.

$\left(\begin{array}{c}5\\ 7\end{array}\right)\left(\begin{array}{cc}1& 6\\  -4& 2\end{array}\right)$

Use cross products to solve each proportion.

$\frac{2}{3}=\frac{a}{42}$