BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem
TTP OnDemand GMAT Video Course
Featured Course

Target Test Prep GMAT OnDemand

Scott Woodbury-Stewart’s private virtual classroom — 400 hours of master-class video lessons for the GMAT Focus Edition.

  • 715+ score guarantee — highest in the industry (99th percentile)
  • 52 chapters · 1,500+ lessons · 4,000+ practice questions
  • 400 hours of video · 1,500+ instructor-led HD smartboard lessons
  • 300,000+ students accepted to Harvard, Stanford, Wharton, Booth & Sloan & more
  • 24/7 live support + weekly Zoom office hours with GMAT instructors
  • TTP AI Assist — 24/7 AI-powered virtual tutor for instant help
  • 1,200+ flashcards + AI-powered study assistant & daily calendar
  • OnDemand, LiveTeach & GMAT Bootcamp formats available
  • Also: GRE, SAT Math & Executive Assessment courses
  • MBA Admissions Consulting now available
  • 🏆 2025 EdTech Breakthrough Award: Test Prep Solution Provider of the Year
  • 200,000+ students served
  • 5-day free trial — $0 to start, no auto-billing, cancel anytime
★★★★★ 5.0 (559 reviews)
130-pt guarantee
$0 to start then $127/mo
Start Free 5-Day Trial Read 559 Reviews →

line p in the x-axis

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
User avatar
GMAT Instructor
Posts: 3650
Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members
Location: India
Thanked: 267 times
GMAT Score:760
by sanju09 » Sat Jul 24, 2010 1:54 am
If the equation of a line p in the coordinate plane is y = 3 x + 2, what is the equation of line q which is a reflection of line p in the x-axis?
A. y = -3 x + 2
B. y = -3 x - 2
C. y = 3 x - 2
D. y = -1/3 x - 5
E. y = -1/3 x + 5
The mind is everything. What you think you become. -Lord Buddha



Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Problem Solving |
User avatar
Legendary Member
Posts: 1460
Joined: Tue Dec 29, 2009 1:28 amFollowed by: 7 members
Thanked: 135 times

by selango » Sat Jul 24, 2010 2:02 am
y=3x+2

(x,y)=(-2/3,2)

Relection in x axis (2/3,2)

y=-3x+2

Pick A
--Anand--
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Newbie | Next Rank: 10 Posts
Posts: 6
Joined: Fri Apr 24, 2009 1:13 am

by Hussain15 » Sat Jul 24, 2010 4:50 am
"C" is my pick. Whats the OA??
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
GMAT Instructor
Posts: 3650
Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members
Location: India
Thanked: 267 times
GMAT Score:760

by sanju09 » Sat Jul 24, 2010 5:35 am
Hussain15 wrote:"C" is my pick. Whats the OA??

When it came to me, I assumed a line with its rise being 3 times as much as its run and the intercept on y-axis being 2 in positive.

When a line is reflected in the x-axis, its intercept on y-axis changes sign only, eliminate A, D, and E; but the intercept on x-axis remains same. This must result in the slope also changing sign only. Now pick B
The mind is everything. What you think you become. -Lord Buddha



Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Legendary Member
Posts: 1460
Joined: Tue Dec 29, 2009 1:28 amFollowed by: 7 members
Thanked: 135 times

by selango » Sat Jul 24, 2010 6:08 am
Sanju,

If the line is reflected on x axis,it either in first or second quadrant..right?

Here the line is in 1st quadrant.Then the reflection must be in 2nd quadrant.

Pls clarify.
--Anand--
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
GMAT Instructor
Posts: 3650
Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members
Location: India
Thanked: 267 times
GMAT Score:760

by sanju09 » Sat Jul 24, 2010 6:18 am
selango wrote:Sanju,

If the line is reflected on x axis,it either in first or second quadrant..right?

Here the line is in 1st quadrant.Then the reflection must be in 2nd quadrant.

Pls clarify.

How can we call a line to be limited to any quadrant, it's the point that could be in any quadrant. A line is free to trespass the borders called the axes.

Try to draw out what I said in the above post, on a rectangular plane, creep through the choices to eliminate few, ask for graphics if doubt remains.
The mind is everything. What you think you become. -Lord Buddha



Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Legendary Member
Posts: 1460
Joined: Tue Dec 29, 2009 1:28 amFollowed by: 7 members
Thanked: 135 times

by selango » Sat Jul 24, 2010 6:21 am
sanju09 wrote:
selango wrote:Sanju,

If the line is reflected on x axis,it either in first or second quadrant..right?

Here the line is in 1st quadrant.Then the reflection must be in 2nd quadrant.

Pls clarify.

How can we call a line to be limited to any quadrant, it's the point that could be in any quadrant. A line is free to trespass the borders called the axes.

Try to draw out what I said in the above post, on a rectangular plane, creep through the choices to eliminate few, ask for graphics if doubt remains.
Can you please explain this with a diagram.

The line y=3x+2 is in second quadrant..rt?
--Anand--
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
GMAT Instructor
Posts: 3650
Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members
Location: India
Thanked: 267 times
GMAT Score:760

by sanju09 » Sat Jul 24, 2010 6:23 am
selango wrote:
sanju09 wrote:
selango wrote:Sanju,

If the line is reflected on x axis,it either in first or second quadrant..right?

Here the line is in 1st quadrant.Then the reflection must be in 2nd quadrant.

Pls clarify.

How can we call a line to be limited to any quadrant, it's the point that could be in any quadrant. A line is free to trespass the borders called the axes.

Try to draw out what I said in the above post, on a rectangular plane, creep through the choices to eliminate few, ask for graphics if doubt remains.
Can you please explain this with a diagram.

The line y=3x+2 is in second quadrant..rt?
only a part of it is in the 2nd quadrant
The mind is everything. What you think you become. -Lord Buddha



Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Legendary Member
Posts: 748
Joined: Sun Jan 31, 2010 7:54 amFollowed by: 3 members
Thanked: 46 times

by outreach » Sat Jul 24, 2010 10:33 am
@selango

reflection in X axis means y value will have opposite sign
Reflection in x axis (-2/3,-2)

HENCE B Shd be the answer
selango wrote:y=3x+2

(x,y)=(-2/3,2)

Relection in x axis (2/3,2)

y=-3x+2

Pick A
-------------------------------------
--------------------------------------
General blog
https://amarnaik.wordpress.com
MBA blog
https://amarrnaik.blocked/
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1