Question

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

Answer 1

( b-1)/(a+2)=(-1-1)/(4+2)
6b-6=2a-4
2a-6b=-2.........Eqn 1
Said that a-b =1.........Eqn 2
Using both the eqns, solve for a & b