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In the x-y plane, region S is defined by x ≤ 0, y ≥ 0 and 3y -5x ≤ 15.

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In the x-y plane, region S is defined by x ≤ 0, y ≥ 0 and 3y -5x ≤ 15.  [#permalink]

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New post 14 May 2017, 06:27
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A
B
C
D
E

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Question Stats:

80% (01:51) correct 20% (01:56) wrong based on 10 sessions

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In the x-y plane, region S is defined by x ≤ 0, y ≥ 0 and 3y -5x ≤ 15. Does the point (a, b) lie in the defined region S, given a and b are integers?

(1) a * b = -4
(2) a – b = 5

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In the x-y plane, region S is defined by x ≤ 0, y ≥ 0 and 3y -5x ≤ 15.  [#permalink]

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New post 14 May 2017, 06:30
I think the answer should be B, because there is no way any solution of a-b=5 can be such that a<=0 and b>=0 which is area S.

Hence the definite answer from option 2 is , if a-b=5 is a,b does NOT lie in area S.

Can someone elaborate where my reasoning is going wrong?
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Re: In the x-y plane, region S is defined by x ≤ 0, y ≥ 0 and 3y -5x ≤ 15.  [#permalink]

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New post 14 May 2017, 07:01
shrutid203 wrote:
In the x-y plane, region S is defined by x ≤ 0, y ≥ 0 and 3y -5x ≤ 15. Does the point (a, b) lie in the defined region S, given a and b are integers?

(1) a * b = -4
(2) a – b = 5



please follow attached fig
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Untitled.png
Untitled.png [ 4.16 KiB | Viewed 594 times ]

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In the x-y plane, region S is defined by x ≤ 0, y ≥ 0 and 3y -5x ≤ 15.  [#permalink]

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New post 14 May 2017, 09:05
1
shrutid203 wrote:
In the x-y plane, region S is defined by x ≤ 0, y ≥ 0 and 3y -5x ≤ 15. Does the point (a, b) lie in the defined region S, given a and b are integers?

(1) a * b = -4
(2) a – b = 5


This is the graph of all equation. In fact, either A or B is sufficient because the graph doesn't intersect with the area S. Hence the correct answer should be D.
Attachment:
Capture.PNG
Capture.PNG [ 29.98 KiB | Viewed 580 times ]


--== Message from the GMAT Club Team ==--

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This discussion does not meet community quality standards. It has been retired.


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To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

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In the x-y plane, region S is defined by x ≤ 0, y ≥ 0 and 3y -5x ≤ 15. &nbs [#permalink] 14 May 2017, 09:05
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