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Re: If these lines intersect at point C, is either m or p greate [#permalink]
04 Jan 2013, 04:10

1

This post received KUDOS

Bunuel wrote:

If these lines intersect at point C, is either m or p greater than 0?

Line a is defined by the equation y = mx + 4.

Line b is defined the the equation y = px - 2.

(1) The x intercept of line b < 0. The x-intercept is the value of x for y=0, thus we are given that 2/p<0, which implies that p<0. So, p is not greater than 0. But we know nothing about m. Not sufficient.

(2) | m | > | p |. Clearly insufficient.

(1)+(2) Still m can be positive as well as negative. For example, m=2 and p=-1 (|m|>|p|) OR m=-2 and p=-1 (|m|>|p|). Not sufficient.

Answer: E.

Hey Bunuel question is either m or p > 0 S1 clearly gives p<0 so why not A ?

Is m value needed here? i'm confused with words either here! _________________

GMAT - Practice, Patience, Persistence Kudos if u like

Re: If these lines intersect at point C, is either m or p greate [#permalink]
05 Jan 2013, 02:18

1

This post received KUDOS

Expert's post

shanmugamgsn wrote:

Bunuel wrote:

Good question.

The question asks is either m or p greater than 0. Now, to have an YES answer we need to know that at least one of them is greater than 0 and to have a NO answer we need to know that neither of them is greater than 0.

We know only that p<0. If m is also less than 0, then we'll have that both are negative, thus the answer would be NO but if m is positive then the answer would be YES.

Hope it's clear.

Ya i got it now Bunuel Thanks. I this case if p>0, we would have not even checked for m straight A would be answer. But since p<0, we gotta check for m>0 or m<0, which leaves us unpredictable. So ans is E.

hope so i understood. pls clarify me Bunuel if i'm wrng. Thanks

That's correct. If from (1) we had that p>0, then this statement would have been sufficient. _________________

Re: If these lines intersect at point C, is either m or p greate [#permalink]
04 Jan 2013, 04:00

Expert's post

1

This post was BOOKMARKED

If these lines intersect at point C, is either m or p greater than 0?

Line a is defined by the equation y = mx + 4.

Line b is defined the the equation y = px - 2.

(1) The x intercept of line b < 0. The x-intercept is the value of x for y=0, thus we are given that 2/p<0, which implies that p<0. So, p is not greater than 0. But we know nothing about m. Not sufficient.

(2) | m | > | p |. Clearly insufficient.

(1)+(2) Still m can be positive as well as negative. For example, m=2 and p=-1 (|m|>|p|) OR m=-2 and p=-1 (|m|>|p|). Not sufficient.

Re: If these lines intersect at point C, is either m or p greate [#permalink]
04 Jan 2013, 04:16

Expert's post

shanmugamgsn wrote:

Bunuel wrote:

If these lines intersect at point C, is either m or p greater than 0?

Line a is defined by the equation y = mx + 4.

Line b is defined the the equation y = px - 2.

(1) The x intercept of line b < 0. The x-intercept is the value of x for y=0, thus we are given that 2/p<0, which implies that p<0. So, p is not greater than 0. But we know nothing about m. Not sufficient.

(2) | m | > | p |. Clearly insufficient.

(1)+(2) Still m can be positive as well as negative. For example, m=2 and p=-1 (|m|>|p|) OR m=-2 and p=-1 (|m|>|p|). Not sufficient.

Answer: E.

Hey Bunuel question is either m or p > 0 S1 clearly gives p<0 so why not A ?

Is m value needed here? i'm confused with words either here!

Good question.

The question asks is either m or p greater than 0. Now, to have an YES answer we need to know that at least one of them is greater than 0 and to have a NO answer we need to know that neither of them is greater than 0.

We know only that p<0. If m is also less than 0, then we'll have that both are negative, thus the answer would be NO but if m is positive then the answer would be YES.

Re: If these lines intersect at point C, is either m or p greate [#permalink]
04 Jan 2013, 18:58

Bunuel wrote:

Good question.

The question asks is either m or p greater than 0. Now, to have an YES answer we need to know that at least one of them is greater than 0 and to have a NO answer we need to know that neither of them is greater than 0.

We know only that p<0. If m is also less than 0, then we'll have that both are negative, thus the answer would be NO but if m is positive then the answer would be YES.

Hope it's clear.

Ya i got it now Bunuel Thanks. I this case if p>0, we would have not even checked for m straight A would be answer. But since p<0, we gotta check for m>0 or m<0, which leaves us unpredictable. So ans is E.

hope so i understood. pls clarify me Bunuel if i'm wrng. Thanks _________________

GMAT - Practice, Patience, Persistence Kudos if u like

Re: If these lines intersect at point C, is either m or p greate [#permalink]
23 Jan 2015, 09:52

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Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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