Question

determine whether the vectors u and v are parallel orthogonal or neitheru=<5,4> v=<-10,9>

Answer 1

a dot product would be useful

Answer 2

if dot = 0, they are perped

if the ratio of like parts is equal, they are parallel

if neither of these conditions hold, then niehter

Answer 3

if u is n times v then both are parallel
if u cross v is =0 then both are orthognol