Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized for You

we will pick new questions that match your level based on your Timer History

Track Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

A line passes through (1,p), is its slope greater than 0? 1) The line passes through (p,13) 2) The line passes through (p,-1)

1) slope = 0 when p=13, but we dont know p, insufficient 2) slope =0 when p=-1, insufficient

1+2) the only way for a line to go through these 3 point is if p =1, so slope equals infinity = > sufficient

C.

I chose C too, but isn't something/0 undefined? A couple of questions here:
(i) is n/0 undefined or infinity(meaning a large number) for the purposes of GMAT (I know as limit x-->0 y tends to infinity and stuff )
(ii) what is the slope of a line parallel to y-axis? undefined or infinity

cuz though i know that individually the data isn't sufficient...ideally, the two together should be...
however if you calculate the two slopes using the two sets of equations and equate them, after simplifying I get:
-1-p=13-p

anyway i suppose if i had to i would pick C...but it did throw me off

cuz though i know that individually the data isn't sufficient...ideally, the two together should be... however if you calculate the two slopes using the two sets of equations and equate them, after simplifying I get: -1-p=13-p

anyway i suppose if i had to i would pick C...but it did throw me off

I got into the same problem too - and then chose C (as either way I was sure that answer will be found by combining both the equations)

could you pls make it clear? coz, it is little confusion. do you mean that the slope = infinite is defined is sufficient answer the question. if so, it is clear. if you mean something/0 = infinite is defined, then its not clear. thanx.

could you pls make it clear? coz, it is little confusion. do you mean that the slope = infinite is defined is sufficient answer the question. if so, it is clear. if you mean something/0 = infinite is defined, then its not clear. thanx.

Defined in the sense we know what it is - infinity, and therefore we can say that it's diffirent from zero.

I don't want to get into the metaphysics of infinity, because frankly I have no clue. hehe

like, k/0 is not defined because we have no idea what it equals, but

[quote="Vithal"]A line passes through (1,p), is its slope greater than 0?
1) The line passes through (p,13)
slope = (13-p)/(p-1)
When 1<p<13 slope>0 otherwise not
Insufficient

2) The line passes through (p,-1)
slope = (p+1)/(1-p)
When -1<p<1 slope >0 otherwise not
Insufficient