Solve the System by Substitution $$\begin{array} { l } x + y = - 12 \\x - y = 2\end{array}$$

Multiple Choice

Solve the system by substitution.
- $$\begin{array} { l } x + y = - 12 \\x - y = 2\end{array}$$

A) $\varnothing$
B) $\{ ( - 5 , - 7 ) \}$
C) $\{ ( - 6 , - 6 ) \}$
D) $\{ ( 5 , - 6 ) \}$