Solve the System of Equations by the Elimination Method $$\left\{ \begin{aligned}7 x + y & = 3 \\3 y & = 9 - 21 x\end{aligned} \right.$$

Multiple Choice

Solve the system of equations by the elimination method.
- $$\left\{ \begin{aligned}7 x + y & = 3 \\3 y & = 9 - 21 x\end{aligned} \right.$$

A) $\left( \frac { 3 } { 7 } , 0 \right)$
B) $( 0,3 )$
C) $\{ ( x , y ) \mid 7 x + y = 3 \}$
D) $\varnothing$