1. The problem statement, all variables and given/known data I am given the forces on picture and I´m asked to find the reactions on both supports. I see they are pin supports so they ask me for 4 unknowns. 2. Relevant equations Sum of forces in both directions equal to zero Sum of torques wrt a convenient point equal to zero THREE equations in total, four unknowns. 3. The attempt at a solution Sum of forces in both directions equal to zero Cx+Dx+200=0 Cy+Dy-150=0 Sum of torques wrt "C" equal to zero 3(Dy)-1,5Dx-(3) 200+ (3)150=0 Since I have THREE equations in total, four unknowns. I assumeI need to analyse members separately. I recall that members are supposed to be treated as weightless and subjected to two forces acting on the same line of action if they are part of a truss. However, Member ABC does´nt look like a truss member. If I analyse pin B I see it can only have horizontal forces acting on it pulling from both sides. Vertically it should have zero force. If I set Cy=0 it leads me to Dx and Dy not being zero both of them and I discovera contradictions if I analyse the member BD because it would have Dx and Dy novanishing and only a horizontal force on the x axis, which produces a pair acting on that member BD.