Solve the System by the Addition Method $$\left\{ \begin{array} { l } 3 x + 6 y = 3 \\2 x + 9 y = - 8\end{array} \right.$$

Multiple Choice

Solve the system by the addition method.
- $$\left\{ \begin{array} { l } 3 x + 6 y = 3 \\2 x + 9 y = - 8\end{array} \right.$$

A) $\{ ( - 5,2 ) \}$
B) $\{ ( x , y ) \mid 3 x + 6 y = 3 \}$
C) $\{ ( 5 , - 2 ) \}$
D) $\varnothing$