Use Matrices to Solve the System of Equations (If Possible) $$\left\{ \begin{array} { l } x + 2 y = 6 \\2 x + y = 9\end{array} \right.$$

Multiple Choice

Use matrices to solve the system of equations (if possible) .Use Gaussian elimination with back-substitution or Gauss-Jordan elimination. $$\left\{ \begin{array} { l } x + 2 y = 6 \\2 x + y = 9\end{array} \right.$$

A) (1, 4)
B) (3, 4)
C) (1, 12)
D) (4, 1)
E) (12, 4)