If the points A(7,-2), B(5,1) and C(3,k) are collinear, then the value of K is:
6
8
4
2
If the point P(5, k-2) lies on the line x−2y+1=0, then find the value of k.
If the points 2^i+4^J,7^i+x^j,−^i+^J are collinear, then the value of x is