Solve the Problem $$\left\{ \begin{array} { l } \frac { 1 } { 2 } x + \frac { 1 } { 2 } y = - 1 \\x - y = 4\end{array} \right.$$

Multiple Choice

Solve the problem.
- $$\left\{ \begin{array} { l } \frac { 1 } { 2 } x + \frac { 1 } { 2 } y = - 1 \\x - y = 4\end{array} \right.$$

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