# Math Help - Vector proof

1. ## Vector proof

A, B, and C are three points on a plane such that O->A = p, O->B = 3q - p and O->C = 9q - 5p.

a) Show that A, B, and C are collinear.
b) State the ratio AB : BC.

Note p, q are vectors.

2. Originally Posted by scorpion007
A, B, and C are three points on a plane such that O->A = p, O->B = 3q - p and O->C = 9q - 5p.

a) Show that A, B, and C are collinear.
b) State the ratio AB : BC.
Note p, q are vectors.
Hi,

I've attached an image to show you what I've calculated.

EB