Write an Equation to Describe the Variation $x$ Varies Directly as the Square Of

Multiple Choice

Write an equation to describe the variation. Use k for the constant of proportionality.
- $x$ varies directly as the square of $y$ and inversely as $z$ .

A) $x = \frac { k y ^ { 2 } } { z }$
B) $x = \frac { k z } { y ^ { 2 } }$
C) $x = k y ^ { 2 } z$
D) $x = k + y ^ { 2 } - z ^ { 2 }$