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# OAs 1 -> C 2 -> E

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Senior Manager
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OAs 1 -> C 2 -> E [#permalink]

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28 Apr 2008, 09:59
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OAs
1 -> C
2 -> E
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File comment: Question 1

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Kudos [?]: 68 [0], given: 0

Senior Manager
Joined: 19 Apr 2008
Posts: 314

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Re: GMATPrep 2 - DS [#permalink]

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28 Apr 2008, 11:40
kyatin wrote:
OAs
1 -> C
2 -> E

a)

1 ) p-q > n

you can put it as p >q+n ; insuff no information about n , n could be +ve or -ve

2) q>p ; doesn't give us information about n at all ; insuff

combining the both if p>q+n and q>p ; n has to be -ve and given that p and q are both positive we know n is < p and q both .

-------------------------------------------------------

b)

1) doesn't give information about y intercept -insuff
2) doesn't give information about y intercept again so insuff . it just tells us slope is downward passing from II quadrant to iV quadrant or passing from IInd quadrant to IIIrd quadrant .

I think what will make this sufficient is either information about y intercept or any x,y coordinate of line k , any thoughts anyone?

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Senior Manager
Joined: 29 Jan 2007
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Re: GMATPrep 2 - DS [#permalink]

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28 Apr 2008, 12:00
rpmodi wrote:
kyatin wrote:
OAs
1 -> C
2 -> E

a)

1 ) p-q > n

you can put it as p >q+n ; insuff no information about n , n could be +ve or -ve

2) q>p ; doesn't give us information about n at all ; insuff

combining the both if p>q+n and q>p ; n has to be -ve and given that p and q are both positive we know n is < p and q both .

-------------------------------------------------------

b)

1) doesn't give information about y intercept -insuff
2) doesn't give information about y intercept again so insuff . it just tells us slope is downward passing from II quadrant to iV quadrant or passing from IInd quadrant to IIIrd quadrant .

I think what will make this sufficient is either information about y intercept or any x,y coordinate of line k , any thoughts anyone?

On Circle-line question, I though C. But I see my mistake. X intercept "greater" than one is pretty much useless info. Cant be used to determine a unique line.
I thought if slope is given which is -1/10 then X intercept being more than 1 means Y intercept has to be greater than 10 ( is that good assumption?). I was not sure if such line having X intercept greater than 1 and Y intercept greater than 10, would intersect circle of radius 1. Any thoughts on that?

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Re: GMATPrep 2 - DS [#permalink]

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28 Apr 2008, 12:00
kyatin,

Please separate and post one question at a time. In conjunction with the other question, I am confused out of my mind

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Senior Manager
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Re: GMATPrep 2 - DS [#permalink]

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28 Apr 2008, 13:07
Quote:
On Circle-line question, I though C. But I see my mistake. X intercept "greater" than one is pretty much useless info. Cant be used to determine a unique line.
I thought if slope is given which is -1/10 then X intercept being more than 1 means Y intercept has to be greater than 10 ( is that good assumption?). I was not sure if such line having X intercept greater than 1 and Y intercept greater than 10, would intersect circle of radius 1. Any thoughts on that?

x intercept being more than one and slope = -1/10 will not give us enuf information about y intecept

take this example

let's assume x intercept = 2
y=mx+b
0=(-1/10)*2+b ; b = 0.2 , so yes line will intersect circle

let's assume x intercept =20
0=(-1/10)*20+b b=2 ; line will not intersect circle .

Hope that helps .....

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Senior Manager
Joined: 29 Jan 2007
Posts: 440

Kudos [?]: 68 [0], given: 0

Location: Earth
Re: GMATPrep 2 - DS [#permalink]

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28 Apr 2008, 13:37
rpmodi wrote:
Quote:
On Circle-line question, I though C. But I see my mistake. X intercept "greater" than one is pretty much useless info. Cant be used to determine a unique line.
I thought if slope is given which is -1/10 then X intercept being more than 1 means Y intercept has to be greater than 10 ( is that good assumption?). I was not sure if such line having X intercept greater than 1 and Y intercept greater than 10, would intersect circle of radius 1. Any thoughts on that?

x intercept being more than one and slope = -1/10 will not give us enuf information about y intecept

take this example

let's assume x intercept = 2
y=mx+b
0=(-1/10)*2+b ; b = 0.2 , so yes line will intersect circle

let's assume x intercept =20
0=(-1/10)*20+b b=2 ; line will not intersect circle .

Hope that helps .....

I saw my mistake , another one.

m = $$\frac{\Delta y}{\Delta x}$$

and NOT $$\frac{\Delta x}{\Delta y}$$

That was great....dont know why I just dint plug in the numbers.

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Re: GMATPrep 2 - DS   [#permalink] 28 Apr 2008, 13:37
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