Last visit was: 22 Apr 2026, 12:00 It is currently 22 Apr 2026, 12:00
Close
GMAT Club Daily Prep
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.
Close
Request Expert Reply
Confirm Cancel
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 22 Apr 2026
Posts: 109,751
Own Kudos:
Given Kudos: 105,821
Products:
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 109,751
Kudos: 810,648
Kudos
Add Kudos
Bookmarks
Bookmark this Post
User avatar
gmatophobia
User avatar
Quant Chat Moderator
Joined: 22 Dec 2016
Last visit: 19 Apr 2026
Posts: 3,173
Own Kudos:
Given Kudos: 1,862
Location: India
Concentration: Strategy, Leadership
Posts: 3,173
Kudos: 11,448
Kudos
Add Kudos
Bookmarks
Bookmark this Post
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 22 Apr 2026
Posts: 109,751
Own Kudos:
Given Kudos: 105,821
Products:
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 109,751
Kudos: 810,648
Kudos
Add Kudos
Bookmarks
Bookmark this Post
User avatar
gmatophobia
User avatar
Quant Chat Moderator
Joined: 22 Dec 2016
Last visit: 19 Apr 2026
Posts: 3,173
Own Kudos:
11,448
 [1]
Given Kudos: 1,862
Location: India
Concentration: Strategy, Leadership
Posts: 3,173
Kudos: 11,448
 [1]
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
gmatophobia
Bunuel
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)

Statement 1

(1) The line passes through (p,13)

Slope =\(\frac{ y_2 - y_1 }{ x_2 - x_1}\) = \(\frac{13 - p }{ p - 1}\)

For certain values of p, the slope is greater than 0. For p = 13, the slope = 0

The statement is not sufficient.

Statement 2

(2) The line passes through (p,-1)

Slope =\(\frac{ y_2 - y_1 }{ x_2 - x_1}\) = \(\frac{ -1-p }{ p - 1}\)

For certain values of p, the slope is greater than 0. For p = -1, the slope = 0

The statement is not sufficient.

Combined

The statements combined

\(\frac{ -1-p }{ p - 1}\) = \(\frac{13 - p }{ p - 1}\)

Solving we can get an unique value of p. Sufficient.

Option C

And what would that solution be? Is the slope greater than 0?

(p-1)(-1-p) = (p-1)(13-p)

(p-1)[-1-p -13 +p] = 0

(p-1) * -14 = 0

p = 1

The slope is undefined.

In fact we can see this behavior using the statements as well. For the same value of p (i.e. x coordinate), the line has two different values of y coordinate. Hence the line is parallel to Y axis.
Moderators:
Math Expert
109751 posts
498 posts
212 posts