book Maths Puzzle Numerical Ability

4d+5=3d+9

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Here is the math problem...Find the valu of k such that (8,k) is collinear with (1,4) and (3,6). What is the formula for this kind of problem? Please help me on this problem.
The question states: What are the coordinates of the point that is on the y-axis 6 units above the x-axis? Is it:

A)(0,-6) B) (0,6) C)(6,0)