[EDIT] I'm going to give mesh analysis another go, and see where that gets me. [DOUBLE EDIT] Mesh analysis didn't get me anywhere :(
Im tearing my hair out over this problem, so any help would be greatly appreciated.
Im solving the circuit with nodal analysis, and following the steps of: 1: Ground node equation
2: Voltage source and current source equations
3: Equations for each resistor
4: KCL at each node apart from the ground node
5: Substituting resistor equations into the KCL equations and solving for the node voltages
6: Solve for branch currents
7: Find power consumed or supplied
The problem is, i get to step 5, find a node voltage, but apparently it's the wrong answer. It doesn't match any of the answers supplied by the teacher (it's a practice multiple choice exam).
Attached is my working, with a picture of the circuit.
I get to a voltage for node B (circled in red), however, when I sub this in to find the voltage at node A, i get the wrong answer (12.8).
Please please please tell me what I am doing wrong.
Thank you in advance