Answer
See the graph
Work Step by Step
Given: $3y=-x-6$
Divide both sides by $3$:
$y=-\frac{1}{3}x-2$
The y-intercept is $-2$. Plot a point $(0,-2)$.
Find the x-intercept:
$0=-\frac{1}{3}x-2$
$-\frac{1}{3}x=2$
$x=-6$
Plot another point $(-6,0)$.
Draw a line through those 2 points.