Find Equations of the Tangent Lines to the Curve $y = \frac { x - 8 } { x + 8 }$

Essay

Find equations of the tangent lines to the curve $y = \frac { x - 8 } { x + 8 }$ that are parallel to the line $x - y = 8 .$
A) $x - y = - 18.5$
B) $x - y = - 4.5$
C) $x - y = - 1.5$
D) $x - y = - 12.5$
E) $x - y = - 15$