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If \(y \ne 1,\) is \(x = 1 ?\)
(1) \(x^2 + y^2 = 1\)
(2) \(y = 1 - x\)
Answer: C
Source: GMAT Prep
(1) \(x^2 + y^2 = 1\)
(2) \(y = 1 - x\)
Answer: C
Source: GMAT Prep
