Solve the System by the Substitution Method $$y ^ { 2 } - x ^ { 2 } = 6$$

Multiple Choice

Solve the system by the substitution method.
- $$y ^ { 2 } - x ^ { 2 } = 6$$
$x - 7 = y$

A) $\left( - \frac { 55 } { 14 } , \frac { 13 } { 14 } \right)$
B) $\left( - \frac { 55 } { 14 } , - \frac { 183 } { 14 } \right)$
C) $\left( \frac { 43 } { 14 } , - \frac { 55 } { 14 } \right)$
D) $\left( \frac { 43 } { 14 } , \frac { 15 } { 2 } \right)$