Question

If three points (k,2k),(2k,3k),(3,1) are collinear, then k is equal to:

Answer 1

I hope that you got your required answer

Answer 2

Step-by-step explanation:

[ k 2k 1 ]

[ 2k 3k 1 ] = 0

[ 3 1 1 ]

=> k (3k-1) -2k(2k-3) + 1(2k-9k) = 0

=> 3k² - k - 4k² + 6k - 7k = 0

=> -k² - 2k = 0

k² + 2k = 0

k(k+2) = 0

k = 0 , -2