Solve the System of Equations by the Substitution Method $\left\{ \begin{array} { l } \frac { 1 } { 2 } x + 2 y = - \frac { 31 } { 4 } \\8 x = - y\end{array} \right.$

Multiple Choice

Solve the system of equations by the substitution method.
- $\left\{ \begin{array} { l } \frac { 1 } { 2 } x + 2 y = - \frac { 31 } { 4 } \\8 x = - y\end{array} \right.$

A) $\left( \frac { 1 } { 2 } , - 4 \right)$
B) $( 2,4 )$
C) $( 0,0 )$
D) $\left( \frac { 1 } { 4 } , - 2 \right)$