Question

If points (1, 2), (-5, 6) and (a, -2) are collinear, then a=
a) -3
b) 7
c) 2​

Answer 1

Answer:

b) 7 is your answer

i think it will help you

Answer 2

Answer:

If the points are collinear then it means that the area of triangle formed by these points is equal to zero. So

Area of triangle= 1/2[x1(y2-y3)+x2(y3-y1)+x3(y1-y2)]

0 =1/2{1(6+2)-5(-2-2)+a(1-6)}

Now, after sloving further you'll got your correct answer...

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