The slope of perpendicular line to the a given line with a known slope is the opposite inverse of that slope. An opposite inverse is the number written as fraction flipped around and its sign changed. (negatives become positives and positives become negatives)
The answer is 56! How you do this, is you take 80, and you multiply it by 7. Then you divide that answer by 10. Then you have your answer! I’m really bad at math but I do know how to do that!
