[johnblacc]

A uniform beam of 6 m length and 300 n weight supports a 400 n load as shown below. Determine the tension in the supporting wire and the force exerted by the pivot on the beam.

[ebaines]

Obviously the figure you tried to include in your post didn't load properly. But in any event - typically these kinds of problems require you to solve three equations in three unknowns: horizontal reaction forces sum to zero, vertical reaction forces sum to zero, and moments sum to zero. First thing to do is draw a free body diagram. The only "trick" is figuring out what point to caculate moments about - if there's a hinge at one end of the beam that's a good place to start.