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# An unclear problem with a DS question

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Joined: 28 Aug 2013
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An unclear problem with a DS question [#permalink]  28 Aug 2013, 19:36
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Question Stats:

40% (00:00) correct 60% (00:16) wrong based on 5 sessions
If p and q are distinct lines in the xy coordinate system such that the equation for p is y= ax + b and the equation for q is y= cx + d, is ac = a²?

(1) d = b + 2
(2) For each point (x, y) on p, there is a corresponding point (x, y + k) on q for some constant x.

I read this question in Princeton Review. In answer part, they show this:
ac = a² so a = c. But if a = 2 and c = -2, for example? I can't get it.
[Reveal] Spoiler: OA
An unclear problem with a DS question   [#permalink] 28 Aug 2013, 19:36
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# An unclear problem with a DS question

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