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题库 / GMATLA-DS-71
In the xy-plane, is the slope of line k positive?
(1) Line k passes through the points (-1, -7) and (2, 5).
(2) Line k has equation y = 4x – 3.
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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这个如果第二个条件改成y=-4x-3，那么第二个还sufficient嘛？我的理解也是sufficient，因为回答了问题：No, it is not positive. 还是说问题一定是求出斜率必须positive？