Solve the System by Substitution $$\begin{aligned}x - 7 y & = 6 \\x & = 8 y\end{aligned}$$

Multiple Choice

Solve the system by substitution.
- $$\begin{aligned}x - 7 y & = 6 \\x & = 8 y\end{aligned}$$

A) $\{ ( - 48 , - 6 ) \}$
B) $\{ ( 6,48 ) \}$
C) $\{ ( 48,6 ) \}$
D) $\left\{ \left( \frac { 7 } { 15 } , \frac { 2 } { 5 } \right) \right\}$