Answer
$y=\dfrac{2}{7}x$
(see graph below)
Work Step by Step
Since $y$ varies directly as $x,$ then it follows the model $y=kx.$ Solving for $k$ by substituting the given point, $(
7,2
),$ results to
\begin{array}{l}\require{cancel}
y=kx
\\
2=k(7)
\\
\dfrac{2}{7}=k
\\
k=\dfrac{2}{7}
.\end{array}
Hence, the direct variation equation is $
y=\dfrac{2}{7}x
.$
Using a table of values, the graph of $
y=\dfrac{2}{7}x
$ is shown above.