Find an Equation of Variation in Which $y$ Varies Inversely As $x$

Multiple Choice

Find an equation of variation in which $y$ varies inversely as $x$ and the following is true.
- $y=0.6$ , when $x=0.9$

A) $y=\frac{1.5}{x}$
B) $y=\frac{0.67}{x}$
C) $y=\frac{0.54}{x}$
D) $y=0.67 x$