Find an Equation of Variation for the Given Situation $y = \frac { 11 z } { x }$

Multiple Choice

Find an equation of variation for the given situation.
-y varies directly as x and inversely as z , and y=4 when x=2 and z=6 .

A) $y = \frac { 11 z } { x }$
B) y=15 x z
C) $y = \frac { 12 x } { z }$
D) $y = \frac { 16 x } { z }$