Solve the System by Any Method $$\left\{ \begin{array} { l } 3 x - 9 y = 7 \\- 6 x + 18 y = - 28\end{array} \right.$$

Multiple Choice

Solve the system by any method.
- $$\left\{ \begin{array} { l } 3 x - 9 y = 7 \\- 6 x + 18 y = - 28\end{array} \right.$$

A) $\varnothing$
B) $\left( \frac { 1 } { 7 } , - \frac { 3 } { 7 } \right)$
C) $( 3,7 )$
D) $( 2,4 )$