Determine the Constant of Variation for the Stated Condition $y$ Varies Directly As

Multiple Choice

Determine the constant of variation for the stated condition.
- $y$ varies directly as $x$ and inversely as the square of $z . y = 9$ when $x = 36$ and $z = 6$ . Find $y$ when $x = 88$ and $z = 5$ .

A) $31.68$
B) $26.4$
C) $15.28$
D) $158.4$