It is currently 11 Dec 2017, 21:33

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

Events & Promotions in June
Open Detailed Calendar

In the equation above, k is a constant. If y = 17 when x = 2

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

Hide Tags

Expert Post
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 42544

Kudos [?]: 135294 [0], given: 12686

In the equation above, k is a constant. If y = 17 when x = 2 [#permalink]

Show Tags

New post 01 Oct 2012, 05:07
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

95% (00:36) correct 5% (00:28) wrong based on 1429 sessions

HideShow timer Statistics

The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

y = kx + 3

In the equation above, k is a constant. If y = 17 when x = 2, what is the value of y when x = 4 ?

(A) 34
(B) 31
(C) 14
(D) 11
(E) 7

Practice Questions
Question: 54
Page: 159
Difficulty: 600


GMAT Club is introducing a new project: The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

Each week we'll be posting several questions from The Official Guide for GMAT® Review, 13th Edition and then after couple of days we'll provide Official Answer (OA) to them along with a slution.

We'll be glad if you participate in development of this project:
1. Please provide your solutions to the questions;
2. Please vote for the best solutions by pressing Kudos button;
3. Please vote for the questions themselves by pressing Kudos button;
4. Please share your views on difficulty level of the questions, so that we have most precise evaluation.

Thank you!
[Reveal] Spoiler: OA

_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

Kudos [?]: 135294 [0], given: 12686

Expert Post
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 42544

Kudos [?]: 135294 [0], given: 12686

Re: In the equation above, k is a constant. If y = 17 when x = 2 [#permalink]

Show Tags

New post 01 Oct 2012, 05:08
SOLUTION

y = kx + 3

In the equation above, k is a constant. If y = 17 when x = 2, what is the value of y when x = 4 ?


(A) 34
(B) 31
(C) 14
(D) 11
(E) 7

Since if \(y = 17\) when \(x = 2\), then \(17 = 2k + 3\) --> \(k=7\).

Thus, \(y = 7x + 3\). When \(x=4\), \(y = 7*4 + 3=31\).

Answer: B.
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

Kudos [?]: 135294 [0], given: 12686

1 KUDOS received
Board of Directors
User avatar
G
Joined: 01 Sep 2010
Posts: 3418

Kudos [?]: 9470 [1], given: 1197

Re: In the equation above, k is a constant. If y = 17 when x = 2 [#permalink]

Show Tags

New post 01 Oct 2012, 05:17
1
This post received
KUDOS
\(y = kx + 3\) is the equation of the slope but in this context the question is different

\(y = K * 2 + 3\)to have y = 17 then K must be 7

\(17 = 7*2 + 3\)

\(y = 7*4 + 3\) ---> \(y = 31\)

B must be the answer. Sub 600

Thanks
_________________

COLLECTION OF QUESTIONS AND RESOURCES
Quant: 1. ALL GMATPrep questions Quant/Verbal 2. Bunuel Signature Collection - The Next Generation 3. Bunuel Signature Collection ALL-IN-ONE WITH SOLUTIONS 4. Veritas Prep Blog PDF Version 5. MGMAT Study Hall Thursdays with Ron Quant Videos
Verbal:1. Verbal question bank and directories by Carcass 2. MGMAT Study Hall Thursdays with Ron Verbal Videos 3. Critical Reasoning_Oldy but goldy question banks 4. Sentence Correction_Oldy but goldy question banks 5. Reading-comprehension_Oldy but goldy question banks

Kudos [?]: 9470 [1], given: 1197

Senior Manager
Senior Manager
avatar
B
Joined: 24 Aug 2009
Posts: 493

Kudos [?]: 876 [0], given: 276

Schools: Harvard, Columbia, Stern, Booth, LSB,
Re: In the equation above, k is a constant. If y = 17 when x = 2 [#permalink]

Show Tags

New post 01 Oct 2012, 19:53
Answer is B.
Same explanation as Carcass's
_________________

If you like my Question/Explanation or the contribution, Kindly appreciate by pressing KUDOS.
Kudos always maximizes GMATCLUB worth
-Game Theory

If you have any question regarding my post, kindly pm me or else I won't be able to reply

Kudos [?]: 876 [0], given: 276

Intern
Intern
avatar
Joined: 30 Aug 2011
Posts: 19

Kudos [?]: 16 [0], given: 17

Location: United States
Concentration: General Management, International Business
Schools: ISB '15
GMAT 1: 680 Q46 V37
WE: Project Management (Computer Software)
Re: In the equation above, k is a constant. If y = 17 when x = 2 [#permalink]

Show Tags

New post 04 Oct 2012, 00:43
Answer is B (=31)

Explanation is same as provided by Carcass above.

Kudos [?]: 16 [0], given: 17

2 KUDOS received
Manager
Manager
avatar
B
Joined: 26 Jul 2011
Posts: 118

Kudos [?]: 137 [2], given: 16

Location: India
WE: Marketing (Manufacturing)
Re: In the equation above, k is a constant. If y = 17 when x = 2 [#permalink]

Show Tags

New post 04 Oct 2012, 02:47
2
This post received
KUDOS
1) Put y =17 and x=2 and solve for K
2) Knowing k=7 from above and x=4 solve for Y ------> Y=31

Answer is B

Kudos [?]: 137 [2], given: 16

Expert Post
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 42544

Kudos [?]: 135294 [0], given: 12686

Re: In the equation above, k is a constant. If y = 17 when x = 2 [#permalink]

Show Tags

New post 04 Oct 2012, 14:14
SOLUTION

y = kx + 3

In the equation above, k is a constant. If y = 17 when x = 2, what is the value of y when x = 4 ?


(A) 34
(B) 31
(C) 14
(D) 11
(E) 7

Since if \(y = 17\) when \(x = 2\), then \(17 = 2k + 3\) --> \(k=7\).

Thus, \(y = 7x + 3\). When \(x=4\), \(y = 7*4 + 3=31\).

Answer: B.

Kudos points given to everyone with correct solution. Let me know if I missed someone.
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

Kudos [?]: 135294 [0], given: 12686

Manager
Manager
avatar
Joined: 25 Jun 2012
Posts: 68

Kudos [?]: 137 [0], given: 21

Location: India
WE: General Management (Energy and Utilities)
Re: In the equation above, k is a constant. If y = 17 when x = 2 [#permalink]

Show Tags

New post 05 Oct 2012, 03:23
1 st step : solve given eqn for K by putting values of x and y. u get k=7
snd step : now put banck value of k=7 and x=4 in given eqn and solve for y.
you get y=31

so Y=31 answer

Kudos [?]: 137 [0], given: 21

Senior Manager
Senior Manager
User avatar
Joined: 13 Aug 2012
Posts: 457

Kudos [?]: 569 [0], given: 11

Concentration: Marketing, Finance
GPA: 3.23
GMAT ToolKit User
Re: In the equation above, k is a constant. If y = 17 when x = 2 [#permalink]

Show Tags

New post 10 Dec 2012, 04:47
y = kx + 3
17 = k(2) + 3 --> 14 = 2k --> k=7

y = (7)(4) + 3 --> y = 31

Answer: B
_________________

Impossible is nothing to God.

Kudos [?]: 569 [0], given: 11

Manager
Manager
avatar
Joined: 07 Apr 2014
Posts: 136

Kudos [?]: 33 [0], given: 81

Re: In the equation above, k is a constant. If y = 17 when x = 2 [#permalink]

Show Tags

New post 10 Sep 2014, 19:16
Bunuel wrote:
The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

y = kx + 3

In the equation above, k is a constant. If y = 17 when x = 2, what is the value of y when x = 4 ?

(A) 34
(B) 31
(C) 14
(D) 11
(E) 7

Practice Questions
Question: 54
Page: 159
Difficulty: 600


GMAT Club is introducing a new project: The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

Each week we'll be posting several questions from The Official Guide for GMAT® Review, 13th Edition and then after couple of days we'll provide Official Answer (OA) to them along with a slution.

We'll be glad if you participate in development of this project:
1. Please provide your solutions to the questions;
2. Please vote for the best solutions by pressing Kudos button;
3. Please vote for the questions themselves by pressing Kudos button;
4. Please share your views on difficulty level of the questions, so that we have most precise evaluation.

Thank you!



given
y=kx+3

y=17 ; x=2

k = 4.

y=? if x = 7

y=31

Kudos [?]: 33 [0], given: 81

Expert Post
Target Test Prep Representative
User avatar
S
Status: Head GMAT Instructor
Affiliations: Target Test Prep
Joined: 04 Mar 2011
Posts: 1793

Kudos [?]: 979 [0], given: 5

Re: In the equation above, k is a constant. If y = 17 when x = 2 [#permalink]

Show Tags

New post 30 May 2016, 05:28
Bunuel wrote:
The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

y = kx + 3

In the equation above, k is a constant. If y = 17 when x = 2, what is the value of y when x = 4 ?

(A) 34
(B) 31
(C) 14
(D) 11
(E) 7


We are given the equation y = kx + 3, where k is a constant.

We are also given that y = 17 when x = 2, so we can plug these values into the equation to first determine a value for k.
y = kx + 3

17 = 2k + 3

14 = 2k

k = 7

We now can determine the value of y when x = 4:

y = kx + 3

y = (7)(4) + 3

y = 28 + 3

y = 31

The answer is B.
_________________

Jeffery Miller
Head of GMAT Instruction

GMAT Quant Self-Study Course
500+ lessons 3000+ practice problems 800+ HD solutions

Kudos [?]: 979 [0], given: 5

Senior Manager
Senior Manager
User avatar
Joined: 18 Jan 2010
Posts: 257

Kudos [?]: 172 [0], given: 9

Re: In the equation above, k is a constant. If y = 17 when x = 2 [#permalink]

Show Tags

New post 30 May 2016, 06:11
Bunuel wrote:
The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions Project

y = kx + 3

In the equation above, k is a constant. If y = 17 when x = 2, what is the value of y when x = 4 ?

(A) 34
(B) 31
(C) 14
(D) 11
(E) 7



Given: y = kx + 3
Putting values of y and x.

17 = 2k+3; 2k = 14; k = 7.

Once k is known, I can calculate y for any value of x.

y = kx + 3
= {(7) * 4} +3
= 31

B is the answer

Kudos [?]: 172 [0], given: 9

Manager
Manager
User avatar
B
Joined: 26 Mar 2016
Posts: 79

Kudos [?]: 16 [0], given: 61

Location: Greece
GMAT 1: 710 Q51 V34
GPA: 2.9
Reviews Badge
Re: In the equation above, k is a constant. If y = 17 when x = 2 [#permalink]

Show Tags

New post 20 Jun 2016, 15:47
The approach is right as seen above.
But I doubt that this question is a 600 difficulty question.
Maybe sub-600 more obviously.
_________________

+1 Kudos if you like the post :)

Kudos [?]: 16 [0], given: 61

Manager
Manager
avatar
S
Joined: 26 Jun 2017
Posts: 114

Kudos [?]: 32 [0], given: 218

Location: Russian Federation
Concentration: General Management, Strategy
WE: Information Technology (Other)
Re: In the equation above, k is a constant. If y = 17 when x = 2 [#permalink]

Show Tags

New post 10 Aug 2017, 12:10
y = kx + 3

In the equation above, k is a constant. If y = 17 when x = 2, what is the value of y when x = 4 ?

(A) 34
(B) 31
(C) 14
(D) 11
(E) 7

May as well to use such approach:
If y = 17 when x = 2 -> 17 = 2k+3
When x = 4, y = 4k+3 = 2*(2k+3)-3=2*17-3=31
The answer is B.

Kudos [?]: 32 [0], given: 218

Intern
Intern
avatar
B
Joined: 13 Sep 2016
Posts: 4

Kudos [?]: 2 [0], given: 43

Re: In the equation above, k is a constant. If y = 17 when x = 2 [#permalink]

Show Tags

New post 20 Aug 2017, 16:10
My approach inspired by a video I saw on GMATPrepNow was pretty quick.
I saw the y intercept in the equation "y = kx + 3" = 3 which implies coordinate (0,3)
Then the question gave away another coordinate (2,17) which shows that there was a 14 point rise in y with a 2 point run in x
Hence, another 2 point run in x makes x=4 and y=17+14=31

Kudos [?]: 2 [0], given: 43

Re: In the equation above, k is a constant. If y = 17 when x = 2   [#permalink] 20 Aug 2017, 16:10
Display posts from previous: Sort by

In the equation above, k is a constant. If y = 17 when x = 2

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


GMAT Club MBA Forum Home| About| Terms and Conditions| 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®.