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How did they get this

How did they get this
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2 votes
How did they get this

How did they get this-example-1
User Sajadre
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2 Answers

2 votes
It's only true if  x=2  and  y= -1 .
User Aronchick
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8.7k points
6 votes
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. 
User Webaddicted
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