Solve Mesh Current: Find iΔ from v/R & 5mA +15.4*i1-5.4i2=0

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orangeincup
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Homework Statement


Use mesh current to solver for iΔ

Homework Equations


v1+v2+... vn=0
i=v/R

The Attempt at a Solution


5mA+15.4*i1-5.4i2=0
9.1*i2+5.42*i1-150iΔ=0

Now I have two equations and three unknowns and I'm unsure how I should proceed. Also, how do I tell what polarity the individual currents are, assuming my reference is a clockwise voltage?
 
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It would help if you would post a circuit diagram.