Answer
Slope: $2$
$y$-intercept: $(0,-6)$
Work Step by Step
Rearrange the equation into slope-intercept form.
$6x-3y=18$
$-3y=-6x+18$
$y=2x-6$
The slope is the coefficient of $x$, and the constant term that is added is the $y$ value in the $y$-intercept of $(0,y)$.
Slope: $2$
$y$-intercept: $(0,-6)$