$\text { Evaluate } \frac { d y } { d x } \text { for the equation } 7 x y = 21 \text { at the given point } ( - 3 , - 1 ) \text {. Round your }$

Multiple Choice

$\text { Evaluate } \frac { d y } { d x } \text { for the equation } 7 x y = 21 \text { at the given point } ( - 3 , - 1 ) \text {. Round your }$ answer to two decimal places.

A) $\frac { d y } { d x } = 7.00$
B) $\frac { d y } { d x } = 63.00$
C) $\frac { d y } { d x } = - 0.33$
D) $\frac { d y } { d x } = - 63.00$
E) $\frac { d y } { d x } = - 3.00$