Use the Gauss-Jordan Method to Solve the System of Equations $$\begin{array} { l } - 5 x - 3 y = - 7 \\- 15 x - 9 y = 7\end{array}$$

Multiple Choice

Use the Gauss-Jordan method to solve the system of equations. If the system has infinitely many solutions, give the
solution with y arbitrary.
- $$\begin{array} { l } - 5 x - 3 y = - 7 \\- 15 x - 9 y = 7\end{array}$$

A) $\varnothing$
B) $\left\{ \frac { 3 } { 4 } y + 7 , y \right\}$
C) $\{ ( 3,3 ) \}$
D) $\{ ( - 7,7 ) \}$