Solve the System of Equations Using Substitution $$\left\{ \begin{array} { l } x ^ { 2 } - y ^ { 2 } = 39 \\x - y = 3\end{array} \right.$$

Multiple Choice

Solve the system of equations using substitution.
- $$\left\{ \begin{array} { l } x ^ { 2 } - y ^ { 2 } = 39 \\x - y = 3\end{array} \right.$$

A) $x = - 8 , y = 5$
B) $x = 8 , y = - 5$
C) $x = - 8 , y = - 5$
D) $x = 8 , y = 5$