Answer:
1/2x
Step-by-step explanation:
To find perpendicular slope, you have to find the inverse of the x. First, though, you have to get y by itself. To do this, subtract x, moving it to the other side of the equation. You end up with y=-x+9. After that, all you need to do is find the opposite x, which is 1/2x. Since it's only asking for a slope, that's your answer.
Hope this helped!
