Solve the System by the Method of Your Choice $$\begin{array} { l } 2 x - 7 y = 5 \\- 6 x + 21 y = - 20\end{array}$$

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.
- $$\begin{array} { l } 2 x - 7 y = 5 \\- 6 x + 21 y = - 20\end{array}$$

A) $\left\{ \left( \frac { 4 } { 15 } , - \frac { 14 } { 15 } \right) \right\}$
B) $\{ ( 3,4 ) \}$
C) $\{ ( x , y ) \mid 2 x - 7 y = 5 \}$
D) $\varnothing$