Solve the System of Equations Using Substitution $$\left\{ \begin{array} { l } x ^ { 2 } + y ^ { 2 } = 113 \\x + y = 15\end{array} \right.$$

Multiple Choice

Solve the system of equations using substitution.
- $$\left\{ \begin{array} { l } x ^ { 2 } + y ^ { 2 } = 113 \\x + y = 15\end{array} \right.$$

A) x = 8, y = 7; x = 7, y = 8
B) x = 8, y = -7; x = 7, y = -8
C) x = -8, y = 7; x = -7, y = 8
D) x = -8, y = -7; x = -7, y = -8