Solve the System by the Method of Your Choice $$\begin{array} { r } x - 6 y = 13 \\2 x - 7 y = 21\end{array}$$

Multiple Choice

Solve the system by the method of your choice. Identify systems with no solution and systems with infinitely many solutions, using set notation to express their solution sets.
- $$\begin{array} { r } x - 6 y = 13 \\2 x - 7 y = 21\end{array}$$

A) $\{ ( 7 , - 1 ) \}$
B) $\{ ( 6,0 ) \}$
C) $\{ ( x , y ) \mid x - 6 y = 13 \}$
D) $\varnothing$