Answer:
-3x + y = -39
Explanation:
If it is perpendicular to y=-1/3x+2, then the slope is positive 3. If it passes through (9, -12), then we can set up our equation:
y+12 / x-9 = 3. Simplifying, we have:
y=3x-39, which in standard form is:
-3x+y= -39
Hope this helps!