In this statically determinate trust with pin joints, the tension (Fi) 
in each member can be obtained from the matrix equation below:

           INPUT1             INPUT2   INPUT1 lbs pushing down
             |                 /-\           on joint 2
            \-/     F4          |       INPUT2 lbs pulling up
            (2)----------------(4)           on joint 4
            /| .pi/6            |\
           / |   .              | \<-- pi/4
          /  |pi/3 .            |  \
         /   |       . F5       |   \
     F1 /pi/4|         .        |    \F9
       /     |F3         .      |F7   \
      /      |             .    |      \
     /       |               .  |       \
    /   F2   |        F6       .|   F8   \
  (1)-------(3)----------------(5)-------(6)
  / \                           |        / \
 /   \                         \ /      /   \    INPUT3 lbs pulling
-------                         -      -------   down on joint 5
 fixed                       INPUT3   on rollers