Use Inverses to Solve Matrix Equations
Write the Linear System $$\begin{array} { l } 8 x + 4 y = 20 \\3 x + 5 y = 4\end{array}$$

Multiple Choice

Use Inverses to Solve Matrix Equations
Write the linear system as a matrix equation in the form AX = B, where A is the coefficient matrix and B is the
constant matrix.
- $$\begin{array} { l } 8 x + 4 y = 20 \\3 x + 5 y = 4\end{array}$$

A) $\left[\begin{array}{ll}8 & 4 \\ 3 & 5\end{array}\right]\left[\begin{array}{l}x \\ y\end{array}\right]=\left[\begin{array}{l}20 \\ 4\end{array}\right]$

B) $\left[\begin{array}{cc}20 & 4 \\ 4 & 3\end{array}\right]\left[\begin{array}{l}x \\ y\end{array}\right]=\left[\begin{array}{l}8 \\ 5\end{array}\right]$

C) $\left[\begin{array}{ll}8 & 3 \\ 4 & 5\end{array}\right]\left[\begin{array}{l}x \\ y\end{array}\right]=\left[\begin{array}{l}20 \\ 4\end{array}\right]$

D) $\left[\begin{array}{ll}8 & 4 \\ 5 & 3\end{array}\right]\left[\begin{array}{l}x \\ y\end{array}\right]=\left[\begin{array}{l}4 \\ 20\end{array}\right]$