Solve the System of Equations Using Substitution $$\left\{ \begin{array} { l } x ^ { 2 } + y ^ { 2 } = 4 \\x + y = 2\end{array} \right.$$

Multiple Choice

Solve the system of equations using substitution.
- $$\left\{ \begin{array} { l } x ^ { 2 } + y ^ { 2 } = 4 \\x + y = 2\end{array} \right.$$

A) $x = 0 , y = 0 ; x = 2 , y = - 2$
B) $x = 0 , y = - 2 ; x = - 2 , y = 0$
C) $x = 2 , y = - 2 ; x = - 2 , y = - 2$
D) $x = 0 , y = 2 ; x = 2 , y = 0$