Basic Circuit Analysis, having difficulties

[coachspoon]

Homework Statement

Hi, this is my first time posting so if there is any advice on how to make this post cleaner, please tell me! I've been stuck on a problem and I can't figure out what I'm doing wrong. I have attached the problem and the attempt at solving the problem below. I am supposed to find E1 using nodal analysis.

Homework Equations

In my work that I attached, I replaced the name E1 with node A. I also used a supernode between A and C.

The Attempt at a Solution

Homework Statement

I solved Va = 10/4, however the solution that my professor gave me says its supposed to be 42/3. Any help is appreciated!

 

[NascentOxygen]

Hi coachspoon! http://img96.imageshack.us/img96/5725/red5e5etimes5e5e45e5e25.gif

Those upside-down Ω symbols don't mean Ohms!

 

[coachspoon]

oh my goodness i didn't notice, I'm a bonehead haha! thank you! let me see if i can solve it properly now.

 

[coachspoon]

I have solved it using conductivity = 1/r. However, I am still getting an incorrect answer. Any help is appreciated!

 

[gneill]

I have solved it using conductivity = 1/r. However, I am still getting an incorrect answer. Any help is appreciated!

Your new result looks good to me.