Solve the System of Equations by the Substitution Method $$\left\{ \begin{array} { r } x + 7 y = 35 \\- 4 x + 8 y = 40\end{array} \right.$$

Multiple Choice

Solve the system of equations by the substitution method.
- $$\left\{ \begin{array} { r } x + 7 y = 35 \\- 4 x + 8 y = 40\end{array} \right.$$

A) $( 1,4 )$
B) $( 0,5 )$
C) $( - 5,0 )$
D) $\varnothing$