Solve the System by Substitution $$\begin{array} { r } x + 8 y = 23 \\2 x + 8 y = 30\end{array}$$

Multiple Choice

Solve the system by substitution.
- $$\begin{array} { r } x + 8 y = 23 \\2 x + 8 y = 30\end{array}$$

A) $\varnothing$
B) $\{ ( - 7,1 ) \}$
C) $\{ ( 7,2 ) \}$
D) $\{ ( 8,7 ) \}$