voltage sources with internal resistances-need a hint

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acelectr

Joined Aug 28, 2010
73
Hi, I am working on the last question of this link http://www.allaboutcircuits.com/worksheets/dcbranch.html and I'm stucked at some point. All voltage sources have some amount of internal resistances. And I think it would prevent me to simply refer to a 24.1 voltage with 1 ohm internal resistance only as a 24.1 voltage source. How can I refer to this voltage source when applying simultaneous equations? In short can someone give me a hint on this question about the parts that I'm having trouble with?
Appreciate any help...
 
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