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标题: GWD 18 - 22 [打印本页]

作者: oldersea 时间: 2005-12-16 20:19 标题: GWD 18 - 22

Q22:
If –2x > 3y, is x negative?
(1) y > 0
(2) 2x + 5y – 20 = 0

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.

选D

why (2) can be sufficient

作者: ghfgss231 时间: 2005-12-16 21:28

画直角坐标就会发现

2X+5y-20=0

-2X>3y

两者重迭区 x必小于0

作者: oldersea 时间: 2005-12-19 07:48

many thanks !!!!

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