What is V_x in the following circuit
You have to go through several step to find \$ V_x\$. 


Find \$V_{R1}\$. You can easily find it thanks to Ohm's law
Since you know \$V_{R1}\$, \$I_{R2}\$ come easy to find.
It is now possible to know how much current the power supply provide to the circuit. (Kirchhoff's current law)
Knowing that amount of current, you can calculate \$V_{R3}\$ and \$V_{R4}\$
Voltage sum of the circuit has to be zero, you can now determine \$V_{x}\$. (Kirchhoff's voltage law)


I hope it helps :)







simulate this circuit &ndash; Schematic created using CircuitLab