Last visit was: 26 Apr 2026, 12:37 It is currently 26 Apr 2026, 12:37
Home
Messages
Tests
Schools
Events
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.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel
Back to Forum
Create Topic
505-555 (Easy)|   Algebra|      
avatar
rocker007
avatar
Current Student
Joined: 06 Oct 2012
Last visit: 25 Oct 2022
Posts: 181
Own Kudos:
46
 [3]
Location: India
Schools: ISB '23 (A) Tuck '24 (WL)
GMAT 1: 740 Q51 V38
GPA: 3.5
Schools: ISB '23 (A) Tuck '24 (WL)
GMAT 1: 740 Q51 V38
Posts: 181
Kudos: 46
 [3]
If y + 40x + 2 = 0, what is the value of xy? Updated on: 06 Sep 2017, 09:31
Originally posted by rocker007 on 06 Sep 2017, 09:26.
Last edited by Bunuel on 06 Sep 2017, 09:31, edited 2 times in total.
Added the OA.
Kudos
Add Kudos
3
Bookmarks
Bookmark this Post
00:00
Start Timer
Pause Timer
Resume Timer
Show Answer
Hide
Show
History
D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

15% (low)

Question Stats:

80% (01:31) correct 20% (01:46) wrong based on 193 sessions

History

Date
Time
Result
Not Attempted Yet
If y + 40x + 2 = 0, what is the value of xy?

(1) 16x = –4y + 28

(2) 13y = 91 – 52x
ShowHide Answer
Official Answer
D
avatar
rocker007
avatar
Current Student
Joined: 06 Oct 2012
Last visit: 25 Oct 2022
Posts: 181
Own Kudos:
46
Location: India
Schools: ISB '23 (A) Tuck '24 (WL)
GMAT 1: 740 Q51 V38
GPA: 3.5
Schools: ISB '23 (A) Tuck '24 (WL)
GMAT 1: 740 Q51 V38
Posts: 181
Kudos: 46
If y + 40x + 2 = 0, what is the value of xy? 06 Sep 2017, 09:50
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Could someone please help me with the explanation.
Since both the equations are simplified to form:

4x+y =7

How do we get xy in this case?
User avatar
imyuva
User avatar
Joined: 18 Apr 2016
Last visit: 31 May 2018
Posts: 50
Own Kudos:
61
Given Kudos: 45
Location: India
GMAT 1: 510 Q46 V17
WE:Web Development (Energy)
GMAT 1: 510 Q46 V17
Posts: 50
Kudos: 61
If y + 40x + 2 = 0, what is the value of xy? 06 Sep 2017, 10:05
Kudos
Add Kudos
Bookmarks
Bookmark this Post
1. We have two equation. Sufficient to find x and y values

Eliminate BCE

2. We have two equation. Sufficient to find x and y values

Hence, its D

Sent from my KIW-L22 using GMAT Club Forum mobile app
avatar
kaulshanx
avatar
Joined: 19 Sep 2016
Last visit: 17 Oct 2018
Posts: 27
Own Kudos:
3
Given Kudos: 3
Posts: 27
Kudos: 3
If y + 40x + 2 = 0, what is the value of xy? 06 Sep 2017, 10:47
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Statement 1 - solving the two equations x=-1/4 & y=8 hence xy=-2
Statement 2 - since it the same line hence the values of x & y will be the same as from statement 1. Hence answer is D

Sent from my SM-N920G using GMAT Club Forum mobile app
User avatar
sashiim20
User avatar
Joined: 04 Dec 2015
Last visit: 05 Jun 2024
Posts: 608
Own Kudos:
1,973
Given Kudos: 276
Location: India
Concentration: Technology, Strategy
Schools: ISB '19 IIMB IIMA XLRI HEC Sept19 intake Rotman '21 NUS '21 NTU '20 Trinity MBA '20 Bocconi '21 Smurfit "21
WE:Information Technology (Consulting)
Schools: ISB '19 IIMB IIMA XLRI HEC Sept19 intake Rotman '21 NUS '21 NTU '20 Trinity MBA '20 Bocconi '21 Smurfit "21
Posts: 608
Kudos: 1,973
If y + 40x + 2 = 0, what is the value of xy? 07 Sep 2017, 07:08
Kudos
Add Kudos
Bookmarks
Bookmark this Post
dheerajkaushik90
If y + 40x + 2 = 0, what is the value of xy?

(1) 16x = –4y + 28

(2) 13y = 91 – 52x
Show more
\(y + 40x + 2 = 0\) --------- (i)

(1) \(16x = –4y + 28\)

\(4x = -y + 7\)

\(y + 4x = 7\) -------- (ii)

Subtracting (i) and (ii) we can find the value of \(x\) and \(y\). Hence we can find the value of \(xy\).

Hence I is Sufficient.

(2) \(13y = 91 – 52x\)

\(y = 7 - 4x\)

\(y + 4x = 7\) ---------- (iii)

Subtracting (i) and (iii) we can find the value of \(x\) and \(y\). Hence we can find the value of \(xy\).

Hence II is Sufficient.

Answer (D)...
avatar
kaulshanx
avatar
Joined: 19 Sep 2016
Last visit: 17 Oct 2018
Posts: 27
Own Kudos:
3
Given Kudos: 3
Posts: 27
Kudos: 3
If y + 40x + 2 = 0, what is the value of xy? 07 Sep 2017, 08:21
Kudos
Add Kudos
Bookmarks
Bookmark this Post
What is the OA for the question

Sent from my SM-N920G using GMAT Club Forum mobile app
User avatar
BrentGMATPrepNow
User avatar
Major Poster
Joined: 12 Sep 2015
Last visit: 31 Oct 2025
Posts: 6,733
Own Kudos:
36,469
Given Kudos: 799
Location: Canada
Expert
Expert reply
Posts: 6,733
Kudos: 36,469
If y + 40x + 2 = 0, what is the value of xy? 11 May 2018, 08:50
Kudos
Add Kudos
Bookmarks
Bookmark this Post
dheerajkaushik90
If y + 40x + 2 = 0, what is the value of xy?

(1) 16x = –4y + 28

(2) 13y = 91 – 52x
Show more

Target question: What is the value of xy?

Given: y + 40x + 2 = 0
Rearrange to get: 40x + y = -2

IMPORTANT: We are given one linear equation. If we given a different linear equation, then we can be certain to solve the system of equations for x and y, which means we can determine the value of xy
So, we need only determine whether each statement provides a linear equation that is different from the given linear equation (40x + y = -2)

Statement 1: 16x = –4y + 28
Divide both sides by 4 to get: 4x = -y + 7
Add y to both sides: 4x + y = 7
This second linear equation is different from the given linear equation (40x + y = -2)
This means we COULD solve the system of equations for x and y, which means we COULD determine the value of xy
Since we COULD answer the target question with certainty, statement 1 is SUFFICIENT

Statement 2: 13y = 91 – 52x
Divide both sides by 13 to get: y = 7 - 4x
Add 4x to both sides: 4x + y = 7
This is the same equation that we have in statement 1.
So, if statement 1 is sufficient, we can also be certain that statement 2 is SUFFICIENT

Answer: D

Cheers,
Brent
User avatar
bumpbot
User avatar
Non-Human User
Joined: 09 Sep 2013
Last visit: 04 Jan 2021
Posts: 38,991
Own Kudos:
1,118
Posts: 38,991
Kudos: 1,118
If y + 40x + 2 = 0, what is the value of xy? 20 Jan 2024, 05:13
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Automated notice from GMAT Club BumpBot:

A member just gave Kudos to this thread, showing it’s still useful. I’ve bumped it to the top so more people can benefit. Feel free to add your own questions or solutions.

This post was generated automatically.
Moderators:
Bunuel
Math Expert
109860 posts
kingbucky
498 posts
Gmat860sanskar
212 posts