Answer
Yes
Work Step by Step
Let $k$ and $m$ be non-zero numbers so that $my=kx$
$my = kx$
$y= k/m*x$
The equation $y= k/m*x$ has a y-intercept of 0. Since there is a non-zero coefficient for $x$, we can say that this equation is a linear equation (and a direct variation equation).
