Find the Variation Equation for the Variation Statement $z$ Varies Directly As

Multiple Choice

Find the variation equation for the variation statement.
- $z$ varies directly as $x$ and inversely as $y ; z = 2$ when $x = 26$ and $y = 91$

A) $z = \frac { 7 } { x y }$
B) $z = \frac { x } { 7 y }$
C) $z = \frac { 7 x } { y }$
D) $z = 7 x y$