Answer
See graph
.

Work Step by Step
Find the intercepts (set x=0, set y=0)
and a check point (set a value for x, find y)
$\left[\begin{array}{lll}
\text {y-intercept } & \text {x-intercept} & \text {checkpoint}\\
& & \\
x=0 & y=0 & x=-3\\
0-9y=18 & 6x-0=18 & 6(-3)-9y=18\\
y=-2 & x=3 & -9y=36\\
& & y=-4\\
(0,-2) & (3,0) & (-3,-4)
\end{array}\right]$
Plot the points and a line through them.