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Solve the system of equations 5x+6y=265x+6y=26 and -x+y=-14−x+y=−14 by combining the equations.    

 

Consider the     –x + y  =  –14 – x + y    

 

If you would add x – y to both sides, you get 0 = –14    

 

However, 0 = –14 cannot be,     

at least, not in our universe,     

so the premise is invalid.    

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