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

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) $x = - 8 , y = - 7 ; x = - 7 , y = - 8$

Correct Answer:

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