Solve the System of Equations by Using the Substitution Method $$\begin{array} { l } 3 ( x + y ) = - 7 - y \\9 x - 1 = 8 + 3 y\end{array}$$

Multiple Choice

Solve the system of equations by using the substitution method.
- $$\begin{array} { l } 3 ( x + y ) = - 7 - y \\9 x - 1 = 8 + 3 y\end{array}$$

A) $\left\{ \left( - \frac { 7 } { 3 } , 0 \right) \right\}$
B) $\left\{ \left( - \frac { 7 } { 3 } , - \frac { 1 } { 3 } \right) \right\}$
C) $\left\{ \left( \frac { 1 } { 3 } , - 2 \right) \right\}$
D) $\left\{ \left( 0 , - \frac { 1 } { 3 } \right) \right\}$