Determine Whether the Variation Model Is of the Form $y = k x$

Multiple Choice

Determine whether the variation model is of the form $y = k x$ or $y = \frac { k } { x }$ and find k.Then write a model that relates y and x. $$\begin{array} { | c | c | c | c | c | c | } \hline x & 4 & 8 & 12 & 16 & 20 \\\hline y & 1 & \frac { 1 } { 2 } & \frac { 1 } { 3 } & \frac { 1 } { 4 } & \frac { 1 } { 5 } \\\hline\end{array}$$

A) $y = 4 x$
B) $y = \frac { 1 } { x }$
C) $y = \frac { 4 } { x }$
D) $y = x$
E) $y = \frac { x } { 4 }$