Ben 10 Alien Force Action Figures

Force vector directed along a line.?

In the figure (the link below), the cable OA exerts a force on point O of F = Fx(i) + Fy(j) + Fz(k).
If the cable's length is a, what are the x, y, and z coordinates of A in terms of a, Fx, Fy, Fz.

http://session.masteringengineering.com/problemAsset/1118657/12/1118657_002.jpg

I'm not sure how to do this. Please help!

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