GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 16 Dec 2018, 09:35

### 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

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

## Events & Promotions

###### Events & Promotions in December
PrevNext
SuMoTuWeThFrSa
2526272829301
2345678
9101112131415
16171819202122
23242526272829
303112345
Open Detailed Calendar
• ### Free GMAT Prep Hour

December 16, 2018

December 16, 2018

03:00 PM EST

04:00 PM EST

Strategies and techniques for approaching featured GMAT topics
• ### FREE Quant Workshop by e-GMAT!

December 16, 2018

December 16, 2018

07:00 AM PST

09:00 AM PST

Get personalized insights on how to achieve your Target Quant Score.

# In the xy-plane, line k and line p intersect at 90-degree angles. If t

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:

### Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 51229
In the xy-plane, line k and line p intersect at 90-degree angles. If t  [#permalink]

### Show Tags

29 Nov 2018, 00:09
00:00

Difficulty:

15% (low)

Question Stats:

69% (00:23) correct 31% (01:01) wrong based on 29 sessions

### HideShow timer Statistics

In the xy-plane, line k and line p intersect at 90-degree angles. If the slope of line k is 1/2, what is the slope of line p ?

A. -2
B. −1/2
C. 0
D. 1/2
E. 2

_________________
Director
Joined: 18 Aug 2017
Posts: 747
Location: India
Concentration: Sustainability, Marketing
WE: Marketing (Energy and Utilities)
Re: In the xy-plane, line k and line p intersect at 90-degree angles. If t  [#permalink]

### Show Tags

30 Nov 2018, 10:43
Bunuel wrote:
In the xy-plane, line k and line p intersect at 90-degree angles. If the slope of line k is 1/2, what is the slope of line p ?

A. -2
B. −1/2
C. 0
D. 1/2
E. 2

for two lines which are perpendicular to each other i.e. intersect at 90 degree product of their slopes has to be equal to -1

so m1*1/2= -1
m1= -2 IMO A
_________________

If you liked my solution then please give Kudos. Kudos encourage active discussions.

VP
Joined: 09 Mar 2016
Posts: 1234
Re: In the xy-plane, line k and line p intersect at 90-degree angles. If t  [#permalink]

### Show Tags

01 Dec 2018, 03:39
Bunuel wrote:
In the xy-plane, line k and line p intersect at 90-degree angles. If the slope of line k is 1/2, what is the slope of line p ?

A. -2
B. −1/2
C. 0
D. 1/2
E. 2

the slopes of perpendecular lines are negative reciprocals of each other: m1*m2 = -1

So, $$m1*\frac{1}{2} =-1$$

$$M1 = -2$$
Re: In the xy-plane, line k and line p intersect at 90-degree angles. If t &nbs [#permalink] 01 Dec 2018, 03:39
Display posts from previous: Sort by

# In the xy-plane, line k and line p intersect at 90-degree angles. If t

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.