Question

Show that the following points are collinear.

(3, 7), (6, 5) and (15, - 1)

Answer 1

you have many ways to solve this for example just do 1/2 I x1 (y2 - y3 ) + x2 (y3 - y1 ) + x3 ( y1 - y2 ) I  and take x1,y1 = 3,7  ... x2 , y2 =6,5......x3 ,y3 = 15,-1 and if u get the answer zero then they are collinear and there is another method called ab+bc=ac where u can take any point as a,b,c in these three points