Solve the System Using the Elimination-By-Addition Method $$\left( \begin{array} { c } x + 6 y = - 9 \\7 x - 6 y = 81\end{array} \right)$$

Multiple Choice

Solve the system using the elimination-by-addition method. $$\left( \begin{array} { c } x + 6 y = - 9 \\7 x - 6 y = 81\end{array} \right)$$

A) ( 16, 4 )
B) ( 8, -4 )
C) ( 9, -3 )
D) ( 21, 9 )
E) ( 4, -8 )