Use the Gauss-Jordan Method to Solve the System of Equations $$\begin{array} { l } 3 x + y = 13 \\3 x + 3 y = 9\end{array}$$

Multiple Choice

Use the Gauss-Jordan method to solve the system of equations. If the system has infinitely many solutions, give the
solution with y arbitrary.
- $$\begin{array} { l } 3 x + y = 13 \\3 x + 3 y = 9\end{array}$$

A) $\{ ( - 2,5 ) \}$
B) $\{ ( - 2 , - 5 ) \}$
C) $\varnothing$
D) $\{ ( 5 , - 2 ) \}$