Find the Equation of the Tangent Line to the Curve $$f ( x ) = - 4 \sqrt { x } ; x = 9$$

Multiple Choice

Find the equation of the tangent line to the curve when x has the given value.
- $$f ( x ) = - 4 \sqrt { x } ; x = 9$$

A) $y = - \frac { 2 } { 3 } x - 8$
B) $y = \frac { 2 } { 3 } x - 6$
C) $y = - \frac { 2 } { 3 } x - 6$
D) $y = - \frac { 2 } { 3 } x + 6$