Question

If a(-2,1) b(a,b)and c(4,1) are collinear find a andb

Answer 1

area of triangle =

½[a1(b2-b3)+a2(b3-b1)+a3(b1-b2)

as points are collinear the area is zero here

a1=-2. b1=1

a2=a. b2=b

a3=4. b3=1

so putting value in eq

a=1 b=1