Answer
( please see image)
Work Step by Step
To graph a line, find two points that belong to it.
x-intercept (y=0)
$3x-0=-9$
$3x=-9$
$x=-3$
Point: $(-3,0)$
y-intercept$ (x=0):$
$3(0)-y=-9$
$-y=-9$
$y=9$
Point: $(0,9)$
Plot the two points and draw a line through them.
( please see image)