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- Homework Statement
- FIind the current through and the potential difference across the 100 ohm resistor.

- Relevant Equations
- junction rule. loop rule

I was following this problem up until they say we can they state I3= I1-I2. I understand why we can say that but I don't see how I can use that to get the system of equation in terms of I1 and I2 at the bottom. Could someone show me how this was done?