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题库 / Prep2007E2-DS-20
If -2x > 3y, is x negative?
(1) y > 0
/>(2) 2x + 5y - 20 = 0
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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(2) -2x>3y联立2x+5y-20=0是否能得出x10, 这个解并不表示当y>10时x10时， -2x>3y且2x+5y-20=0。
要确定x的情况，将y>10代入任何一式，确认出x
(1) if y > 0, -2x > 0 , therefore x < 0
(2) 5y - 20 = -2x > 3y, therefore 5y-20 . 3y, y > 10,. -2x > 3 *10 , therefore x < 0
D. each is sufficient.