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OverLord2011 [107]
3 years ago
13

How did they get this

Mathematics
2 answers:
alexandr1967 [171]3 years ago
7 0
It's only true if  x=2  and  y= -1 .
katrin2010 [14]3 years ago
3 0
Somewhere in the text, it must say that x = 2 and y = -1 or else, the values just seem made up out of thin air. 
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3 years ago
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