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(inequality) Is x2>y2

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(inequality) Is x2>y2

by Max@Math Revolution » Sat Sep 24, 2016 9:41 pm
(ex 19) (inequality) Is x2>y2?
1) x+y=2
2) x>y
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Source: — Data Sufficiency |
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by Max@Math Revolution » Tue Sep 27, 2016 8:09 am
==> In the original condition, C is highly likely to be an answer since the variable becomes two (x,y). 1) & 2), x^2-y^2>0?, in (x-y)(x+y)>0? you get x-y>0, and thus x+y=2>0. The answer is always yes, therefore suffi. Hence, the answer is C.

answer: C
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