Question

if the points A (-2,1) B ( a,b) C(4,1) are collinear and a-b=1 find the value of a and b

Answer 1

Since it is given that the points are collinear, therefore - area triangle ABC=0,
Apply area of triangle, u will get this equation :6=6b then b=1. now a-b=1(given),so a=2.
Therefore a=2 and b=1
Hope this will help u :)

Answer 2

This is your answer

Hope you understand!