Solve the System of Equations Using Substitution $$\left\{ \begin{array} { l } y = x ^ { 2 } - 12 x + \\x + y = 18\end{array} \right.$$

Multiple Choice

Solve the system of equations using substitution.
- $$\left\{ \begin{array} { l } y = x ^ { 2 } - 12 x + \\x + y = 18\end{array} \right.$$

A) $x = 2 , y = 16 ; x = 9 , y = 9$
B) $x = 6 , y = 12$
C) $x = 2 , y = 20 ; x = 9 , y = 9$
D) $x = - 2 , y = 20 ; x = - 9 , y = 27$