The discussion centers on solving electrical circuit equations using z-parameters, specifically V1 and V2 equations. Participants emphasize the importance of showing work rather than just providing answers, highlighting the need to understand the definitions of z-parameters in relation to port currents and voltages. One user suggests consulting course notes or reliable resources like Wikipedia for clarity on these definitions. The conversation also notes that exam scenarios may not provide familiar examples, stressing the need for a solid grasp of the concepts. Overall, understanding the foundational definitions is key to solving the equations accurately.
Rather than trying to extrapolate a guess from a given example I'd suggest using the definitions of the individual z-parameters. Your text or course notes should define them in terms of port currents and voltages. Barring that, Wikipedia does a reasonable job showing their definitions. With them you can find the parameters for a 2-port network and be confident in the results.
You probably won't have handy examples to work from on an exam ;)
TL;DR: This determine the support reactions at A & B
I tried calculate moment about a which is 2a(By + Bx + Ey + Ex +F) + a (Gy + Gx + Cy + Cx). But I don't think I'm correct, any help would be appreciated, this was a question on a final exam paper in my Mechanics course.