Find the Slope of the Tangent Line to the Curve $x ^ { 3 } + y ^ { 3 } = 6 x y$

Multiple Choice

Find the slope of the tangent line to the curve $x ^ { 3 } + y ^ { 3 } = 6 x y$ at the point (3, 3) .

A) $- 3$
B) $- 2$
C) $- 1$
D) 0
E) 1
F) 2
G) 3
H) 4