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Why not C? Using Point A and B, equation of line joining both points can be found, finally slope ( say m) We know that line is perpendicular with those parallel lines. (So slope of these lines will be -1/m) Using one Point A and slope (-1/m) we can derive equation Like wise, Point B can be done.

Why not C? Using Point A and B, equation of line joining both points can be found, finally slope ( say m) We know that line is perpendicular with those parallel lines. (So slope of these lines will be -1/m) Using one Point A and slope (-1/m) we can derive equation Like wise, Point B can be done.

Please explain

Do we know that the line joining points A and B is perpendicular to these parallel lines??... The figure suggests so, however, there is no mention of that in the question statement.. We cannot determine that this line is perpendicular... _________________

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Re: What are the equations of the two parallel lines shown here? [#permalink]
05 Jan 2013, 21:26

The diagram given in the problem is deceiving. You assumed the line AB is perpendicular to those parallel lines, however those parallel line can have any slope. Check below diagram.

Coordinates of A & B does not help to find out the slope of parallel lines. Hence the correct answer choice is (E)

Attachment:

Parallel Lines.jpg [ 86.23 KiB | Viewed 929 times ]

Why not C? Using Point A and B, equation of line joining both points can be found, finally slope ( say m) We know that line is perpendicular with those parallel lines. (So slope of these lines will be -1/m) Using one Point A and slope (-1/m) we can derive equation Like wise, Point B can be done.

Re: What are the equations of the two parallel lines shown here? [#permalink]
14 Aug 2014, 21:43

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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