Solve the System by the Method of Substitution $$\left\{ \begin{aligned}x - y & = - 8 \\x ^ { 2 } - y & = - 21\end{aligned} \right.$$

Multiple Choice

Solve the system by the method of substitution.​ $$\left\{ \begin{aligned}x - y & = - 8 \\x ^ { 2 } - y & = - 21\end{aligned} \right.$$ ​

A) $\left( \frac { 25 } { 3 } , - \frac { 38 } { 3 } \right)$
B) $\left( - \frac { 25 } { 3 } , - \frac { 38 } { 3 } \right)$
C) $\left( - \frac { 25 } { 3 } , \frac { 38 } { 3 } \right)$
D) No solution
E) $\left( \frac { 25 } { 3 } , \frac { 38 } { 3 } \right)$