How to Correctly Solve the Circuit with Supernode Equations?

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SUMMARY

The discussion focuses on solving circuit equations using supernode analysis, specifically addressing an error in the formulation of a supernode equation. The user correctly established the equation: -12 + 75(I1 - I3) + 14(I2 - I3) + 49(I4) = 0, but encountered issues with the second equation in their matrix, particularly regarding the treatment of a 34V source following a 39 Ohm resistor. The oversight in accounting for the voltage source led to confusion in the circuit analysis process.

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Homework Statement



http://piazza.com/view/gsqhumgwtax

Homework Equations


The Attempt at a Solution



I got everything right except in Q4 matrix (second equation 2nd and 3d slots)

my supernode equation is
I got this equation. Going clockwise
= -12+75(I1-I3)+14(I2-I3)+49(I4)=0
3048 = 75I1 + 14 I2 + 49I4

can anyone see what am i doing wrong
 
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What happened to the 34V source that follows the 39 Ohm resistor in the loop?
 

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