Solve the System by the Substitution or Elimination Method $$\left( \begin{array} { r l r } x - y & = 3 \\x ^ { 2 } - y ^ { 2 } & = 45\end{array} \right)$$

Multiple Choice

Solve the system by the substitution or elimination method. $$\left( \begin{array} { r l r } x - y & = 3 \\x ^ { 2 } - y ^ { 2 } & = 45\end{array} \right)$$

A) ( $-$ 9, 6)
B) (6, 9)
C) (9, $-$ 6)
D) (9, 6)