Solve the System by Substitution $$\begin{array} { l } x + y = - 2 \\x - y = - 8\end{array}$$

Multiple Choice

Solve the system by substitution.
- $$\begin{array} { l } x + y = - 2 \\x - y = - 8\end{array}$$

A) $\varnothing$
B) $\{ ( - 6,4 ) \}$
C) $\{ ( 5,4 ) \}$
D) $\{ ( - 5,3 ) \}$