Solve the Problem $$\left\{ \begin{array} { l } - 7 x + 9 y = - 21 \\- 4 x - 2 y = - 12\end{array} \right.$$

Multiple Choice

Solve the problem.
- $$\left\{ \begin{array} { l } - 7 x + 9 y = - 21 \\- 4 x - 2 y = - 12\end{array} \right.$$

A) $\{ ( 2,1 ) \}$
B) $\{ ( 3,0 ) \}$
C) no solution; $\varnothing$
D) $\{ ( 3,1 ) \}$