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Intern  Joined: 06 May 2012
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In the rectangular coordinate system above, if the coordinates of poin  [#permalink]

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Question Stats: 76% (00:54) correct 24% (01:06) wrong based on 121 sessions

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In the rectangular coordinate system above, if the coordinates of point P are (5,y), what is the value of y?

(1) The coordinates of point M are (5,0).

(2) The coordinates of point N are (0,−4).

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Intern  Joined: 06 May 2012
Posts: 7
Re: In the rectangular coordinate system above, if the coordinates of poin  [#permalink]

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I am getting E

Since we are not sure whether NP is perpendicular to MP, we cant determine y=-4..

Can we trust the figure in DS?
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Re: In the rectangular coordinate system above, if the coordinates of poin  [#permalink]

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saurabh87 wrote:
I am getting E

Since we are not sure whether NP is perpendicular to MP, we cant determine y=-4..

Can we trust the figure in DS?

Although not drawn to scale ... we can take NP to be perpendicular to Y axis and MP perpendicular to X axis.

though we cannot say info in statement 1 is sufficient.
statement 2 is definitely sufficient.
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In the rectangular coordinate system above, if the coordinates of poin  [#permalink]

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How do you know PN is parallel to the x-axis. If it is given that it is parallel, then the answer will be B.
The answer should be E in this case.

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Re: In the rectangular coordinate system above, if the coordinates of poin  [#permalink]

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B.Statement 2 alone is sufficient.
The points M and N are projections of P on x and y coordinates. So PN || x axis and PM || y axis.

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In the rectangular coordinate system above, if the coordinates of poin  [#permalink]

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ShreyasCM wrote:
B.Statement 2 alone is sufficient.
The points M and N are projections of P on x and y coordinates. So PN || x axis and PM || y axis.

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ShreyasCM
It is nowhere stated that M and N are projections of P on x and y coordinates. As far as I know, one should always consider what is given in the question rather then 'assume' on his/her own. P can have coordinates (5, -4.00000000000000000000001). In this case also the figure would look like the one given in the question.
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Re: In the rectangular coordinate system above, if the coordinates of poin  [#permalink]

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14101992 wrote:
ShreyasCM wrote:
B.Statement 2 alone is sufficient.
The points M and N are projections of P on x and y coordinates. So PN || x axis and PM || y axis.

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ShreyasCM
It is nowhere stated that M and N are projections of P on x and y coordinates. As far as I know, one should always consider what is given in the question rather then 'assume' on his/her own. P can have coordinates (5, -4.00000000000000000000001). In this case also the figure would look like the one given in the question.

For your kind information can you please check the OA mentioned in the below link,

www.gmatclub/forum/in-rectangular-coord ... 221304.htm

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Intern  Joined: 06 May 2012
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In the rectangular coordinate system above, if the coordinates of poin  [#permalink]

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saurabh87 wrote:
In the rectangular coordinate system above, if the coordinates of point P are (5,y), what is the value of y?

(1) The coordinates of point M are (5,0).

(2) The coordinates of point N are (0,−4).

Experts please explain why B??
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Joined: 04 Jun 2016
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GMAT 1: 750 Q49 V43 In the rectangular coordinate system above, if the coordinates of poin  [#permalink]

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saurabh87 wrote:
In the rectangular coordinate system above, if the coordinates of point P are (5,y), what is the value of y?

(1) The coordinates of point M are (5,0).

(2) The coordinates of point N are (0,−4).

In the rectangular coordinate system above, if the coordinates of point P are (5,y), what is the value of y?
We need the exact coordinate for y

I am working with the assumptions that they dotted lines are supposed to be parallel to the x and y axis. (this belief was bolstered when I saw the 2nd statement and found out that p and m has the same x coordinate x=5 and thus the sole purpose of the dotted line is to show parallelism. If you don't agree then the answer will change to E)
(1) The coordinates of point M are (5,0).
All we know from this is that p and m are two points on a vertical line passing through x=5
Gives no info about y. Not even some other hint to derive "y" by using distance formula or midpoint formula, pythagorys theorem... NOTHING to move with forward with.
INSUFFICIENT

(2) The coordinates of point N are (0,−4)
Delivers us the value of Y on a platter. y = -4
This is what we are looking for. P becomes (5,-4)
SUFFICIENT

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Originally posted by LogicGuru1 on 19 Jul 2016, 11:04.
Last edited by LogicGuru1 on 19 Jul 2016, 11:51, edited 1 time in total.
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Re: In the rectangular coordinate system above, if the coordinates of poin  [#permalink]

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I have a feeling that the diagram in the original question (in the Princeton Review book) had some information that was not included in the poster's diagram.
I say this because, without any additional information, the answer is E
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Re: In the rectangular coordinate system above, if the coordinates of poin  [#permalink]

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answer should be E.

as discussed above nowhere it is stated that line is parallel to x axis.
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Re: In the rectangular coordinate system above, if the coordinates of poin  [#permalink]

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saurabh87 wrote:
In the rectangular coordinate system above, if the coordinates of point P are (5,y), what is the value of y?

(1) The coordinates of point M are (5,0).

(2) The coordinates of point N are (0,−4).

Answer should be B.

OG clearly states that Diagrams should be taken as a source of truth unless clearly stated that Diagrams are not drawn to scale.

Since, in this question, nothing of that sort is mentioned, we will assume(as per OG) that PM and NP are perpendicular to respective axis.
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Re: In the rectangular coordinate system above, if the coordinates of poin  [#permalink]

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abhimahna wrote:
saurabh87 wrote:
In the rectangular coordinate system above, if the coordinates of point P are (5,y), what is the value of y?

(1) The coordinates of point M are (5,0).

(2) The coordinates of point N are (0,−4).

Answer should be B.

OG clearly states that Diagrams should be taken as a source of truth unless clearly stated that Diagrams are not drawn to scale.

Since, in this question, nothing of that sort is mentioned, we will assume(as per OG) that PM and NP are perpendicular to respective axis.

Can you provide a reference for this? Math Expert V
Joined: 02 Sep 2009
Posts: 58364
Re: In the rectangular coordinate system above, if the coordinates of poin  [#permalink]

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truongvu31 wrote:
abhimahna wrote:
saurabh87 wrote:
In the rectangular coordinate system above, if the coordinates of point P are (5,y), what is the value of y?

(1) The coordinates of point M are (5,0).

(2) The coordinates of point N are (0,−4).

Answer should be B.

OG clearly states that Diagrams should be taken as a source of truth unless clearly stated that Diagrams are not drawn to scale.

Since, in this question, nothing of that sort is mentioned, we will assume(as per OG) that PM and NP are perpendicular to respective axis.

Can you provide a reference for this? In its current form, the answer tot the question is E, not C. We cannot assume that angle P is 90 degrees. This is why the question is tagged as poor quality.

LOCKING THE TOPIC.
_________________ Re: In the rectangular coordinate system above, if the coordinates of poin   [#permalink] 24 Mar 2018, 08:58
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