Solve the System $$\left\{ \begin{array} { r } 3 x + y = 12 \\9 x + 3 y = 36\end{array} \right.$$

Multiple Choice

Solve the system.
- $$\left\{ \begin{array} { r } 3 x + y = 12 \\9 x + 3 y = 36\end{array} \right.$$

A) $\varnothing$
B) $( 5 , - 3 )$
C) $( 0,12 )$
D) $\{ ( x , y ) \mid 9 x + 3 y = 36 \}$