Solve the System of Equations by the Substitution Method $$\begin{array} { r } x - 3 y = - 30 \\- 5 x - 4 y = - 2\end{array}$$

Multiple Choice

Solve the system of equations by the substitution method.
- $$\begin{array} { r } x - 3 y = - 30 \\- 5 x - 4 y = - 2\end{array}$$

A) $\{ ( - 6,8 ) \}$
B) $\{ ( - 7,9 ) \}$
C) $\{ ( 6,9 ) \}$
D) $\varnothing$