Answer
$y=-\frac{1}{3}x$
Work Step by Step
The point-slope form of a line is given as:
$$y-y_1=m(x-x_1)$$
We plug in the given point and slope and solve for $y$:
$$y-0=-\frac{1}{3}(x-0)\Longrightarrow y=-\frac{1}{3}x
.$$
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