Answer:
-3
Explanation:
So this equation is currently in standard form, so you want to convert it to y-intercept form(you can also convert it into another form, but I would prefer this).
Treat this equation algebraically first.
Subtract 6x from both sides, and then you are left with 2y=-6x+9. Now divide two from both sides, and you are left with y=-3x+9/2. Now since you know the slope is in front of the x, that is your answer.
Hope this helps!