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

Redeem

Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

★★★★★5.0559 reviews
Vote for Target Test Prep, Newsweek Readers’ Choice Awards 2026
NEWSWEEK READERS’ CHOICE 2026

BIG NEWS! Target Test Prep has been nominated, and they’d love your vote!

TTP has worked incredibly hard to build the best test prep experience possible, and winning Newsweek’s 2026 Readers’ Choice Award for Best Test Prep would mean a lot to them. If TTP has helped you, they’d be incredibly grateful for your vote. You can vote once each day through September 9.

Vote for TTP
GMATLiveTeach 7 seats left
Chris Peckover
NEXT LIVE COHORT

Oct 13 to Jan 7, 2027

with Chris Peckover

Schedule
Tue, Thu · 8:00 to 10:00 PM ET
Included
40 live hours + 6 months of GMAT OnDemand
  • Live instruction and real-time questions
  • Class recordings and assigned practice
View class & enroll
Limited cohort · enrollment openTarget Test Prep
EALiveTeach 5 seats left
Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

Schedule
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
View EA class & enroll
Limited cohort · enrollment openTarget Test Prep
GMATOnDemand Start anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

715+ score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions
Start free 5-day trial
Read 559 reviewsTarget Test Prep

Compare the format, schedule, and included access before enrolling. Prices and seat counts shown reflect the supplied offer details.

Data Sufficiency - Manipulations

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 190
Joined: Thu Jan 14, 2010 8:29 pm
Thanked: 2 times
by phoenix9801 » Sat Jan 01, 2011 5:23 pm
Is XY = -1 ?

(1) x = y
(2) y = 1

My question is how come statement (1) is sufficient?
The Gmat said if x = y, then the question can be rephrased thus: x^2= -1? (I do not see the connect how do you move from x=y to x^2= -1 ???)

Also if you want to combine both statements it would be x =y=1. How is it the same as xy =1 (come someone please explain)


I would greatly appreciate it if you can explain in details...
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Data Sufficiency |
User avatar
Legendary Member
Posts: 543
Joined: Tue Jun 15, 2010 7:01 pmFollowed by: 3 members
Thanked: 147 times

by anshumishra » Sat Jan 01, 2011 5:50 pm
phoenix9801 wrote:Is XY = -1 ?

(1) x = y
(2) y = 1

My question is how come statement (1) is sufficient?
The Gmat said if x = y, then the question can be rephrased thus: x^2= -1? (I do not see the connect how do you move from x=y to x^2= -1 ???)

Also if you want to combine both statements it would be x =y=1. How is it the same as xy =1 (come someone please explain)


I would greatly appreciate it if you can explain in details...
xy = -1 ?

Statement 1:
x = y
=> xy = x^2 This will never be -1 -> as x,y belongs to the set of real number
Sufficient -> As we can say xy!= -1 or xy is never equal to -1.

Statement 2 :
y=1
=> xy = x; Not Sufficient (As if x=-1, then xy = -1 else xy is not equal to -1)

Hence A.
Thanks
Anshu

(Every mistake is a lesson learned )
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1