Solve the System of Equations by the Substitution Method $$\begin{array} { l } 5 x - 3 y = 49 - 5 x \\3 x + 7 y = x + 6 y + 5\end{array}$$

Multiple Choice

Solve the system of equations by the substitution method.
- $$\begin{array} { l } 5 x - 3 y = 49 - 5 x \\3 x + 7 y = x + 6 y + 5\end{array}$$

A) $\left. \left\{ \int \frac { 49 } { 10 } , 0 \right) \right\}$
B) $\{ ( 4 , - 3 ) \}$
C) $\{ ( 4,3 ) \}$
D) $\{ ( 0,49 ) \}$