Solve the System of Equations by the Substitution Method $\begin{aligned}- 2 x - 3 y & = - 21 \\x & = - 5 y\end{aligned}$

Multiple Choice

Solve the system of equations by the substitution method.
- $\begin{aligned}- 2 x - 3 y & = - 21 \\x & = - 5 y\end{aligned}$

A) $\{ ( 16 , - 3 ) \}$
B) $\{ ( 15 , - 3 ) \}$
C) $\{ ( 15,3 ) \}$
D) $\{ ( - 3,15 ) \}$