GRE

简答题 If 2y-X=1 and y-X=2，then which of the following is true?

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D．Because Y—χ=2．you know that Y=2+χ．You can substitute this into 2y—χ=1 to make it 2(2+χ)-χ=1，which simplifies t0 4+χ=1 0rχ=-3．You then substitute y=2+χ=2+(-3)=-1 and conclude that χ=-3 and Y=-1．

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