天山-6-13

bobochen

If x and y are positive, is 3x > 7y?
(1)   x > y + 4
(2)   -5x < -14y
   
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.
Answer:  d

我选的是b, 条件1是通过带入具体的数试出来的吗？用式子能够推导出来吗？

bobochen

拿天山、GWD搜索了都没有！好像天山的讨论特别少！自己顶一下！