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## Homework Statement

This is the circuit I'm working on:

## Homework Equations

My equations are:

4.64v=-200I1-800I3

4.64v=750I3+800I2

4.64v=-200I1-750I3

## The Attempt at a Solution

I should have a third unknown in each equation. I not seeing where I'm going wrong. I'm supposed to put this in a 3X3 matrix and have Excel solve for the simultaneous equations. Any help?