91Ó°ÊÓ

Solve each equation.

$\left[\begin{array}{cc}9& 13\end{array}\right]\mathbf{=}\left[\begin{array}{cc}x+2y& 4x+1\end{array}\right]$

Perform the indicated matrix operation. If the matrix doesn’t exist, write impossible.

7.

$4\left[\begin{array}{cc}2& 7\\ −3& 6\end{array}\right]+5\left[\begin{array}{cc}−6& −4\\ 3& 0\end{array}\right]$

Solve the system of equation.

$\begin{array}{l}x+y=−3\\ 3x+4y=−12\end{array}$

Solve the system of equation.

$\begin{array}{l}x+y=10\\ 2x+y=11\end{array}$

Solve the system of equation.

$\begin{array}{l}2x+y=5\\ 4x+y=9\end{array}$

Solve the system of equation.

$\begin{array}{l}3x+5y=2\\ 2x−y=−3\end{array}$

Solve the system of equation.

$\begin{array}{l}6x+2y=22\\ 3x+7y=41\end{array}$

Solve the system of equation.

$\begin{array}{l}3x−2y=−2\\ 4x+7y=65\end{array}$

Find the value of each determinant.

$\left|\begin{array}{cc}-3& -6\\ 4& 8\end{array}\right|$

For exercises 8 and 9, use the table that shows a five-day forecast indicating high (H) and low (L) temperatures.

Organize the temperatures in a matrix.