Solve the System by the Substitution Method $$\begin{array} { l } x - 2 y = 3 \\x ^ { 2 } - x y = 20\end{array}$$

Multiple Choice

Solve the system by the substitution method.
- $$\begin{array} { l } x - 2 y = 3 \\x ^ { 2 } - x y = 20\end{array}$$

A) $\left\{ ( 5,1 ) , \left( - 8 , - \frac { 11 } { 2 } \right) \right\}$
B) $\left\{ ( - 5 , - 1 ) , \left( 8 , \frac { 11 } { 2 } \right) \right\}$
C) $\left\{ ( 5,1 ) , \left( - \frac { 11 } { 2 } , - 8 \right) \right\}$
D) $\left\{ ( - 5 , - 1 ) , \left( \frac { 11 } { 2 } , 8 \right) \right\}$