Question

Find k if point A (1,2) , B (1/2,3) and C (0,k) are collinear

Answer 1

x1(y2-y3)+x2(y3-y1)+x3(y1-y2)=0
1(3-k)+1/2(k-2)+0(2-k)=0
3-k+1/2k-1=0
2-1/2k=0
-1/2k=-2
1/2k=2
k=4

Answer 2

Answer:

Step-by-step explanation:

According to the question.

By ∆area formula

Eq will be 6-2k+k-2=0

K=4.