1. The problem statement, all variables and given/known data We say two ordered pairs p1=(x1,y1) and p2=(x2,y2) are perpendicular if and only if x1x2 +y1y2=0. For any three ordered pairs p1, p2, and p3, if p1 is perpendicular to p2 and p2 is perpendicular to p3 then how would I show that p1 is parallel to p3? I believe I need to somehow show that p1 and p3 have a similar scalar, but I do not know how to show that work. So if someone could show me, that would be awesome. 2. Relevant equations 3. The attempt at a solution haha, i tried setting the two perpendicular equations equal to each other, but I don't know if that amounted to anything.