Question

in each of the following find the value of K for which the points are collinear (K, 2)(2,3)(-1,2)

Answer 1

| 1 1 1. |
|. k. 2. -1.|. = 0
|. 2. 3. 2 |.
determinent = 0

7 - 2k - 2 + 3k - 4 = 0

1 + k = 0

so k = -1