Solve the System by the Addition Method $$\begin{array} { l } 4 x + 6 y = - 42 \\2 x - 4 y = 0\end{array}$$

Multiple Choice

Solve the system by the addition method.
- $$\begin{array} { l } 4 x + 6 y = - 42 \\2 x - 4 y = 0\end{array}$$
$2 x - 4 y = 0$

A) $\{ ( - 6 , - 2 ) \}$
B) $\{ ( - 7 , - 2 ) \}$
C) $\{ ( - 6 , - 3 ) \}$
D) $\varnothing$