Question 549656
Kx + Ky = 0
4x + 2Ky = 0 
:
multiply the 1st equation by 2, and you have
2kx + 2ky = 0
4x  + 2ky = 0
-------------------subtraction eliminates 2ky, find k
2kx - 4x + 0 = 0
2kx = 4x
divide both sides by 2x
k = 2
:
I'm not sure how you would get k=0