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What are the equations of the two parallel lines shown here?

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What are the equations of the two parallel lines shown here? [#permalink] New post 05 Jan 2013, 20:41
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

60% (01:29) correct 40% (00:00) wrong based on 15 sessions
Attachment:
screen_shot_cordinate_geometry.png
screen_shot_cordinate_geometry.png [ 41.68 KiB | Viewed 589 times ]


What are the equations of the two parallel lines shown here?

(1) Point A has coordinates (0,2)

(2) Point B has coordinates (-3,0)

[Reveal] Spoiler:
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
[Reveal] Spoiler: OA

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Re: What are the equations of the two parallel lines shown here? [#permalink] New post 05 Jan 2013, 21:22
shanmugamgsn wrote:
Attachment:
screen_shot_cordinate_geometry.png


What are the equations of the two parallel lines shown here?

(1) Point A has coordinates (0,2)

(2) Point B has coordinates (-3,0)

[Reveal] Spoiler:
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] New post 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
Parallel Lines.jpg [ 86.23 KiB | Viewed 576 times ]

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Re: What are the equations of the two parallel lines shown here? [#permalink] New post 05 Jan 2013, 22:25
Yes MacFauz and PraPon.
You guys are right!!!!

There is no assurance those two point need to be perpendicular neither slope needs to be same ...
I was fooled with diagram!! :oops:
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Re: What are the equations of the two parallel lines shown here? [#permalink] New post 06 Jan 2013, 00:16
Expert's post
shanmugamgsn wrote:
Attachment:
screen_shot_cordinate_geometry.png


What are the equations of the two parallel lines shown here?

(1) Point A has coordinates (0,2)

(2) Point B has coordinates (-3,0)

[Reveal] Spoiler:
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


Similar question to practice: lines-k-and-m-are-parallel-to-each-other-is-the-slope-of-100447.html
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Re: What are the equations of the two parallel lines shown here?   [#permalink] 06 Jan 2013, 00:16
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