Engineering Op-Amp Circuit Analysis: Troubleshooting Incorrect Node Usage

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Using nodes V1 and V2 yields the correct output voltage Vo of -2.5V, while using nodes V1 and Vo results in an incorrect answer. The discussion highlights the importance of correctly identifying node currents in op-amp circuit analysis. Clarification is sought regarding the currents entering node Vo and the derivation of equations used. Proper understanding of node relationships and current flow is crucial for accurate analysis in op-amp circuits.
paulmdrdo
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In the problem below, when I use nodes V1 and V2 I get the correct answer of Vo = -2.5v
But when I use nodes V1 and Vo I get an incorrect answer. Please explain to me why my latter method did not work.
Thanks.

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Do you have all the currents going into node Vo?
 
I'd be happy to help if I could read your writing and if you showed where your equations come from.
 

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