Collinearity is refering to position of points in line.Originally Posted by ligekron
Given points are collinear if line contains all of them. If line doesn't contain all of them then they are non-collinear.
Please explain: (1) Collinearity, (2) Proving collinearity
for the high school level
Since your heading says "Vectors", I assume a vector approach is in order.
Three points are collinear (lie on a straight line)
if any two of their vectors are scalar multiples of each other.