Pivoting Motion Path Functionality

The effect I'm trying to create is a stick figure waving his arm. In order to do this, I was thinking of drawing two lines (one for the forearm and one for the bicep) with their intersect point being an 'elbow'. I was hoping that I could apply motion pathing to the 'forearm' line to move the line in an arc while maintaining contact with the 'elbow'.  I assumed I would be able to maintain a pivot point and not have to move the whole line, but it doesn't seem to be working. Does anyone know if this is possible?

 

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