Circuit is:
http://img521.imageshack.us/img521/1750/12343p.jpg

Teacher used superposition to find the answer

I wanted to try it using the node method

I have the voltage at the v+ and v- terminals... but having trouble relating that to Vout... I tried figured out the current in the non-inverting portion of the op-amp by doing

(Vout - Vm) / 3 where Vm is v-, but that got me nowhere

 

Circuit is:
http://img521.imageshack.us/img521/1750/12343p.jpg

Teacher used superposition to find the answer

I wanted to try it using the node method

I have the voltage at the v+ and v- terminals... but having trouble relating that to Vout... I tried figured out the current in the non-inverting portion of the op-amp by doing

(Vout - Vm) / 3 where Vm is v-, but that got me nowhere

You are starting with a good approach. You have one equation and one unknown (that is "e"). So you can solve for "e" and now you have a simple inverting amplifier with a V+ reference different from ground.

 

Hmm I don't see the inverting amp part... I see the non-inverting amp with the 3 and 2 ohm resistors

http://img521.imageshack.us/img521/8115/6777d.jpg

 

What answer is required? Vo?

If so, you haven't finished the problem.

You need to write another equation involving Vo.

 

Cool - figured it out:

http://img206.imageshack.us/img206/1983/24366.jpg

 

What answer is required? Vo?

If so, you haven't finished the problem.

You need to write another equation involving Vo.

Yup they wanted an expression for Vo