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题库 / Prep2007E2-DS-110
If x and y are integers and x > 0, is y > 0 ?
(1) 7x - 2y > 0
(2) -y < x
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
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如果（1）变式为7X-2Y>0; (2)变式为7x+7y>0。两式加起来不就是5y>0？？？？那y>0不就成立了吗？？？？