Answer
The y-intercept of the line is $-9$.
Work Step by Step
We are given $-3x-2y=18$
$\rightarrow -2y=3x+18$
$\rightarrow y=\frac{-3}{2}x-9$
The slope of the line is $\frac{-3}{2}$.
We have the form: $y=mx+b$
$m=\frac{-3}{2}$ and $b=-9$
Thus the y-intercept of the line is $-9$.