Find an Equation of the Tangent Line at the Indicated $$y = f ( x ) = 8 \sqrt { x } - x + 7 , ( x , y ) = ( 64,7 )$$

Multiple Choice

Find an equation of the tangent line at the indicated point on the graph of the function.
- $$y = f ( x ) = 8 \sqrt { x } - x + 7 , ( x , y ) = ( 64,7 )$$

A) $y = 7$
B) $y = - \frac { 1 } { 2 } x + 7$
C) $y = \frac { 1 } { 2 } x - 39$
D) $y = - \frac { 1 } { 2 } x + 39$