GWD 5 Q36

serendipityh · 发表于 2009-10-14 20:53:00

In the xy-plane, line l and
line k intersect at the point (16/5, 12/5). What is the slope of line l?

(1) The
product of the slopes of line l and line k is –1.

(2) Line k passes through the origin.
答案是C
我选B
(2)能算出K的斜率, 两条线垂直不能算出L的斜率吗?

[此贴子已经被作者于2009/10/14 20:54:36编辑过]

alan722 · 发表于 2009-10-14 21:00:00

不看条件一的话，题目哪里说了垂直了

serendipityh · 发表于 2009-10-14 21:14:00

谢谢!! 看错了!!

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