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题库 / GMATLA-DS-44
If Line k in the xy-plane has equation y=mx + b, where m and b are constants, what is the slope of k?
(1) k is parallel to the line with equation y=(1-m)x+b +1.
(2) k intersects the line with equation y=2x+3 at the point (2, 7).
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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the slope of line k and the other line are the same since the two lines are parallel, and thus m= 1 - m, and therefore m= 1/2. 平行代表斜率一样
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