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

It is currently 17 Nov 2018, 17:48

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
Events & Promotions in November
PrevNext
SuMoTuWeThFrSa
28293031123
45678910
11121314151617
18192021222324
2526272829301
Open Detailed Calendar
  • FREE Quant Workshop by e-GMAT!

     November 18, 2018

     November 18, 2018

     07:00 AM PST

     09:00 AM PST

    Get personalized insights on how to achieve your Target Quant Score. November 18th, 7 AM PST
  • How to QUICKLY Solve GMAT Questions - GMAT Club Chat

     November 20, 2018

     November 20, 2018

     09:00 AM PST

     10:00 AM PST

    The reward for signing up with the registration form and attending the chat is: 6 free examPAL quizzes to practice your new skills after the chat.

What is the slope of line l? (1) Line l and line m are perpendicular.

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

Hide Tags

Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 50623
What is the slope of line l? (1) Line l and line m are perpendicular.  [#permalink]

Show Tags

New post 29 Aug 2018, 00:27
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

87% (00:44) correct 13% (00:28) wrong based on 23 sessions

HideShow timer Statistics

Director
Director
User avatar
G
Joined: 20 Feb 2015
Posts: 796
Concentration: Strategy, General Management
Premium Member
What is the slope of line l? (1) Line l and line m are perpendicular.  [#permalink]

Show Tags

New post 29 Aug 2018, 00:42
Bunuel wrote:
What is the slope of line l?

(1) Line l and line m are perpendicular.
(2) Line m has y–intercept 6 and passes through the point (–3, 5).



(1) Line l and line m are perpendicular.
the two lines can have any orientation
insufficient.

(2) Line m has y–intercept 6 and passes through the point (–3, 5).
point slope form of the line is given by y =mx+c
substituting the value
5=m(-3) + 6
m=1/3

insufficient

using both

we know that for two perpendicular lines m1*m2=-1
where m1 and m2 are respective slopes

substituting the value we can get the value of m2
sufficient.
C
Senior Manager
Senior Manager
User avatar
S
Status: Come! Fall in Love with Learning!
Joined: 05 Jan 2017
Posts: 494
Location: India
Premium Member
Re: What is the slope of line l? (1) Line l and line m are perpendicular.  [#permalink]

Show Tags

New post 29 Aug 2018, 01:40
Hi,

It’s a pretty straight-forward question.

Question: What is the slope of line l ?

Rule: If two lines are perpendicular to each other, then the product of their slopes are equal to -1.

Statement I is insufficient:

Line l and line m are perpendicular.

According to the above rule, we know that product of the slopes of lines m and l is equal to -1

But we don’t know the slope of both the lines. So we cant find the slope of line l.

So statement I is insufficient.

Statement II is insufficient:

Line m has y–intercept 6, i.e., (0,6) and passes through the point (–3, 5).

Given two points, we can find the slope of line m. (No need to find the final value as long as we are clear that there is will be only one value).

But question is about slope of line l.

So insufficient.

Together it is sufficient,

We can find the slope of line l, as line “m” and line “l” are perpendicular to each other and slope of “m” is given in statement II.

So the answer is C.
_________________

GMAT Mentors
Image

GMAT Club Bot
Re: What is the slope of line l? (1) Line l and line m are perpendicular. &nbs [#permalink] 29 Aug 2018, 01:40
Display posts from previous: Sort by

What is the slope of line l? (1) Line l and line m are perpendicular.

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


Copyright

GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

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®.