I am preparing for a quiz I have on Thursday. It's about KCL and KVL, very basic.

The example goes like this, Va on top and Vb on bottom:

Find Vx with the answer being Vx = 2V.

I tried this problem, got -2V, and could not for the life of me figure out why my sign for Vx is wrong, unless the professor's answer is wrong.

I gave the resistors these terminals because if you follow the direction of current, current entering a positive and exiting a negative terminal, then you will get a voltage drop. After using the rightmost loop for KVL I found that going clockwise and keeping the same polarity for the resistor makes the current source a voltage drop and the resistor a voltage rise (current going into negative and exiting positive terminal).

Vab, I understand, is Vb-Va. So why is that when I take Vb (zero) and subtract Va (2V) I don't get the same answer as the professor provided me with?