Question

Find the relation between x and y if the points (x,y),(1,2) and (7,0) are collinear.

Answer 1

if points are collinear
x1 (y2-y3)+x2 (y3-y1)+x3 (y1-y2)=0
x (2-0)+1 (0-y)+7 (y-2)=0
2x-y+7y-14=0
2x+6y-14=0
x+3y=7

Answer 2

Hope this would help...