Solve the System by the Best Method $$\left\{ \begin{array} { c } x + 8 y = - 61 \\8 x + 7 y = - 89\end{array} \right.$$

Multiple Choice

Solve the system by the best method. Use set notation to express the solution set.
- $$\left\{ \begin{array} { c } x + 8 y = - 61 \\8 x + 7 y = - 89\end{array} \right.$$

A) no solution; $\varnothing$
B) $\{ ( - 5 , - 7 ) \}$
C) $\{ ( 5 , - 6 ) \}$
D) $\{ ( - 6 , - 6 ) \}$