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Re: Lines L and M intersect at (-2,-2). Is the Value of X- intercept of L [#permalink]
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Expert Reply
Maxximus wrote:
Hello,

Some confusion here. The OA is E and not A.

Bunuel, bb, please change the OA.

Here is the official video explanation-



Thanks
Experts' Global team


Edited the OA. Thank you for checking all the questions. Appreciate it.

P.S. You can tag only me in future posts. I'll take care of the edits.
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Re: Lines L and M intersect at (-2,-2). Is the Value of X- intercept of L [#permalink]
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srikanth9502 wrote:
Lines L and M intersect at (-2,-2). Is the Value of X- intercept of L greater than that of M?

1) Slope of L is greater than that of M.
2) Slope of L is positive.

Source : Experts Global


Combined insufficient as shown in the graph below. The problem is if L has a positive slope, M can either have a smaller positive slope or negative slope which completely changes the x-intercept position.
Attachments

Multiple M lines.png
Multiple M lines.png [ 49.86 KiB | Viewed 6680 times ]

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Re: Lines L and M intersect at (-2,-2). Is the Value of X- intercept of L [#permalink]
srikanth9502 wrote:
Lines L and M intersect at (-2,-2). Is the Value of X- intercept of L greater than that of M?

1) Slope of L is greater than that of M.
2) Slope of L is positive.

Source : Experts Global

I have a samll query
Stmt A:

If L is parallel to x axis its slope will be zero and if m is negative slope so l>m in slope but my qsn is if line is parallel to x axis so it has y intercept but no x intercept ,so how will this case fit in?or this is absolete case for such option
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Lines L and M intersect at (-2,-2). Is the Value of X- intercept of L [#permalink]
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srikanth9502 wrote:
Lines L and M intersect at (-2,-2). Is the Value of X- intercept of L greater than that of M?

1) Slope of L is greater than that of M.
2) Slope of L is positive.

Source : Experts Global


Given: Lines L and M intersect at (-2,-2).

Asked: Is the Value of X- intercept of L greater than that of M?

Let Line L be: y+2 = m1 (x+2) = m1x + 2m1; y = m1x + 2m1 -2 (1)
Let Line M be: y+2 = m2 (x+2) = m2x + 2m2; y = m2x + 2m2 -2 (2)

x - intercept of line L : y = 0 = m1x + 2m1 -2 ; x = 2(1-m1)/m1 = 2(1/m1 -1)
x - intercept of line M: y = 0 = m2x + 2m2 -2; x = 2(1-m2)/m2 = 2(1/m2 -1)

1) Slope of L is greater than that of M.
m1 > m2
Since signs of m1 & m2 are unknown
NOT SUFFICIENT

2) Slope of L is positive.
m1>0
Since there is no information about m2.
NOT SUFFICIENT

(1) + (2)
1) Slope of L is greater than that of M.
m1 > m2
Since signs of m1 & m2 are unknown
2) Slope of L is positive.
m1>0
Since sign of m2 is unknown
NOT SUFFICIENT

IMO E

Originally posted by Kinshook on 03 Sep 2019, 09:12.
Last edited by Kinshook on 13 Sep 2019, 22:20, edited 1 time in total.
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Re: Lines L and M intersect at (-2,-2). Is the Value of X- intercept of L [#permalink]
Expert Reply
vanam52923 wrote:
srikanth9502 wrote:
Lines L and M intersect at (-2,-2). Is the Value of X- intercept of L greater than that of M?

1) Slope of L is greater than that of M.
2) Slope of L is positive.

Source : Experts Global

I have a samll query
Stmt A:

If L is parallel to x axis its slope will be zero and if m is negative slope so l>m in slope but my qsn is if line is parallel to x axis so it has y intercept but no x intercept ,so how will this case fit in?or this is absolete case for such option


Good question! This problem assumes L must have an x-intercept so we can ignore this special case. Besides that, this only fits in (1) which is insufficient anyways.
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Re: Lines L and M intersect at (-2,-2). Is the Value of X- intercept of L [#permalink]
Kinshook wrote:
srikanth9502 wrote:
Lines L and M intersect at (-2,-2). Is the Value of X- intercept of L greater than that of M?

1) Slope of L is greater than that of M.
2) Slope of L is positive.

Source : Experts Global


Given: Lines L and M intersect at (-2,-2).

Asked: Is the Value of X- intercept of L greater than that of M?

Let Line L be: y+2 = m1 (x+2) = m1x + 2m1; y = m1x + 2m1 -2 (1)
Let Line M be: y+2 = m2 (x+2) = m2x + 2m2; y = m2x + 2m2 -2 (2)

x - intercept of line L : y = 0 = m1x + 2m1 -2 ; x = 2(1-m1)/m1 = 2(1/m1 -1)
x - intercept of line M: y = 0 = m2x + 2m2 -2; x = 2(1-m2)/m2 = 2(1/m2 -1)

1) Slope of L is greater than that of M.
m1 > m2
1/m1<1/m2
2(1/m1-1) < 2(1/m2 -1)
x-intercept of Line L < x-intercept of Line M
SUFFICIENT

2) Slope of L is positive.
m1>0
Since there is no information about m2.
NOT SUFFICIENT

IMO A

hi Kinshook

I am afraid the solution is wrong.

the operation here in statement 1
m1 > m2
1/m1<1/m2

assumes that m1 and m2 are positive .. which may not be the case.

lets say m1=1 and m2=-2, here m1>m2 but 1/m1>1/m2

statement 1 is therefore insufficient.
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Re: Lines L and M intersect at (-2,-2). Is the Value of X- intercept of L [#permalink]
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azhrhasan wrote:
Kinshook wrote:
srikanth9502 wrote:
Lines L and M intersect at (-2,-2). Is the Value of X- intercept of L greater than that of M?

1) Slope of L is greater than that of M.
2) Slope of L is positive.

Source : Experts Global


Given: Lines L and M intersect at (-2,-2).

Asked: Is the Value of X- intercept of L greater than that of M?

Let Line L be: y+2 = m1 (x+2) = m1x + 2m1; y = m1x + 2m1 -2 (1)
Let Line M be: y+2 = m2 (x+2) = m2x + 2m2; y = m2x + 2m2 -2 (2)

x - intercept of line L : y = 0 = m1x + 2m1 -2 ; x = 2(1-m1)/m1 = 2(1/m1 -1)
x - intercept of line M: y = 0 = m2x + 2m2 -2; x = 2(1-m2)/m2 = 2(1/m2 -1)

1) Slope of L is greater than that of M.
m1 > m2
1/m1<1/m2
2(1/m1-1) < 2(1/m2 -1)
x-intercept of Line L < x-intercept of Line M
SUFFICIENT

2) Slope of L is positive.
m1>0
Since there is no information about m2.
NOT SUFFICIENT

IMO A

hi Kinshook

I am afraid the solution is wrong.

the operation here in statement 1
m1 > m2
1/m1<1/m2

assumes that m1 and m2 are positive .. which may not be the case.

lets say m1=1 and m2=-2, here m1>m2 but 1/m1>1/m2

statement 1 is therefore insufficient.


azhrhasan

Corrected. Thanks
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Re: Lines L and M intersect at (-2,-2). Is the Value of X- intercept of L [#permalink]
Sorry this is my curiosity

Understood the M slope is the key here but what about the B - the y-intercept - in a way that even if the slope is the same - say is it correct to say that if the Y-intercept or the B is different, the X intercept also cant be determined?
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Lines L and M intersect at (-2,-2). Is the Value of X- intercept of L [#permalink]
1
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I have some doubt in this question.
First, what is meaning of higher slope. With two negative values of m (y=mx+c), should we consider m with sign or without.
Second, should we consider x intercept with sign or not.
Please help .
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Re: Lines L and M intersect at (-2,-2). Is the Value of X- intercept of L [#permalink]
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Bunuel, please could you answer @sagerpgh question? I have a similar doubt. The question says "Is the Value of X- intercept of L greater than that of M?" Should we not consider sign here? If the x-intercept of a line is -2, would we take +2 or -2 to compare with the value of other slope? Thank you in advance!
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Re: Lines L and M intersect at (-2,-2). Is the Value of X- intercept of L [#permalink]
Expert Reply
Wizard8 wrote:
Bunuel, please could you answer @sagerpgh question? I have a similar doubt. The question says "Is the Value of X- intercept of L greater than that of M?" Should we not consider sign here? If the x-intercept of a line is -2, would we take +2 or -2 to compare with the value of other slope? Thank you in advance!


I suggest before attempting questions to brush up the basics.

24. Coordinate Geometry



For more check Ultimate GMAT Quantitative Megathread

Hope it helps.
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Re: Lines L and M intersect at (-2,-2). Is the Value of X- intercept of L [#permalink]
the answer should be A as in case when L has a positive slope and M has a negative slope, then the magintude of = X intercept of M is greater than that of L. So A should be sufficient . when we are talking about intercept , we only see magnitude not the sign of intercept . So i feel answer A should be correct
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Re: Lines L and M intersect at (-2,-2). Is the Value of X- intercept of L [#permalink]
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