Solving a Statics Question - Reaction Force Ay

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Hello, so I have a statics question which I am having trouble with.

The question is : A boom is supported by a ball and socket joint at A and a guy wire at B.If the loads in the cables are each 8kN and they lie in a plane which is parallel to the x-z plane, what is the magnitude of the reaction force Ay for equilibrium.

I made a sketch with all the forces but the problem is I am getting too many unknown forces to solve.So I am thinking maybe I wrongly showed the forces.My sketch is shown below and the questions image also.
Thanks

http://img46.imageshack.us/img46/2759/stsk.jpg
 
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The 8 kN forces each have vertical components of 4 kN. Take moments about an axis parallel to Ax but passing through B, and you get Ay directly from this equation.
 
ok thks ill try that
 

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