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. $$\begin{array} { | c | c | c | c | c | c | } \hline x & 9 & 18 & 27 & 36 & 45 \\\hline y & 2 & 4 & 6 & 8 & 10 \\\hline\end{array}$$

A) $y = \frac { 2 } { 9 } x$
B) $y = \frac { 9 } { x }$
C) $y = \frac { 2 } { 9 x }$
D) $y = \frac { 9 } { 2 x }$
E) $y = \frac { 9 } { 2 } x$