Find the voltage, Vx, and current, Ix
From your comments I assume you are unsure about how to solve the last two equations.
You have two equations and two variables. We have several tricks for solving in this situation.

First trick (recommended): 
Solve for one variable in terms of the other, and plug that into the other equation.
Here is a nice video that explains how to do it (clicky).

Second trick:
Use a matrix to solve for both variables at once (in a manner of speaking).

Doing either of these will give you the current Ix. Once you have that you can use it and the appropriate resistor value (v = IR) to get the value of Vx.

I don't want to work the problem for you, but if you get the wrong answer I would suggest revisiting your two initial mesh equations.