CPM Homework Help : PC3 Problem 9-129

Use a matrix equation to solve the system of linear equations.

$3x + 4y = 5\\ x + 2y = 3$

Step:

$\begin{bmatrix}3&4\\1&2\end{bmatrix}\begin{bmatrix}x\\y\end{bmatrix}=\begin{bmatrix}5\\3\end{bmatrix}$

Hint:

If $AX = B$ , then $X = A^{−1}B$ .