Question

If (k, 2), (2, 3) and (3, 4) are collinear, then the value of 'k' is ​

Answer 1

k (3-4) +2(4-2) +3(2-3) =0

-k+4-3=0

k=1

here is your answer

Answer 2

using formula

y²-y¹/x²-x¹

3-2/2-k=4-3/3-2

1/2-k=1/1

1=2-k

-2+1=-k

-1=-k

cancel the negative sign

k=1