Answer
$y=\sqrt {3}x$
Work Step by Step
The equation of a line can be written as $y=mx+b$ where $m$ is the slope and $b$ is the $y$-intercept.
As the line passes through the origin, $b$ is 0.
$m=\tan\theta=\tan 60^{\circ}=\sqrt 3$
Therefore, the equation of the line is $y=\sqrt {3}x$