Find the value of Vx and power dissipated

[FRZY]

Homework Statement

I'm looking to find the value of Vx and power dissipated or provided by the dependent source.

Homework Equations

I used KVL to get around the loop, but I'm not sure if that's correct.

The Attempt at a Solution

The main loop I get 10+3Va+10kI = 0.

No clue what to do next. I keep thinking left and right loop, but I already see 4 unknowns 3 equations. Unless I need a junction where I1=-I2. I just don't get it.
Please help, or get my on the right track.

 

[lewando]

Your equation looks okay. One equation, 2 unknowns. You need another one. Consider expressing V_A in terms of the 10K resistor and I.