Answer:
-3
Step-by-step explanation:
If you mean 1/3 slope, then -3/1 or -3 since the opposite inverse rule says that perpendicular lines are opposite inverses of each other. In other words, flip the order of 1/3 to 3/1 and add a negative sign. This makes sense, since the lines would go in opposite directions.
I'm always happy to help :)
