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In the equation above, k is a constant. If y = 17 when x = 2 [#permalink]
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01 Oct 2012, 05:07
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The Official Guide for GMAT® Review, 13th Edition  Quantitative Questions Projecty = kx + 3In 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 ProjectEach 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!
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Re: In the equation above, k is a constant. If y = 17 when x = 2 [#permalink]
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01 Oct 2012, 05:08



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Re: In the equation above, k is a constant. If y = 17 when x = 2 [#permalink]
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01 Oct 2012, 05:17
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Re: In the equation above, k is a constant. If y = 17 when x = 2 [#permalink]
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01 Oct 2012, 19:53
Answer is B. Same explanation as Carcass's
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Re: In the equation above, k is a constant. If y = 17 when x = 2 [#permalink]
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04 Oct 2012, 00:43
Answer is B (=31)
Explanation is same as provided by Carcass above.



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Re: In the equation above, k is a constant. If y = 17 when x = 2 [#permalink]
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04 Oct 2012, 02:47
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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



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Re: In the equation above, k is a constant. If y = 17 when x = 2 [#permalink]
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04 Oct 2012, 14:14



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



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Re: In the equation above, k is a constant. If y = 17 when x = 2 [#permalink]
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10 Dec 2012, 04:47
y = kx + 317 = k(2) + 3 > 14 = 2k > k=7y = (7)(4) + 3 > y = 31Answer: B
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Re: In the equation above, k is a constant. If y = 17 when x = 2 [#permalink]
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10 Sep 2014, 19:16
Bunuel wrote: The Official Guide for GMAT® Review, 13th Edition  Quantitative Questions Projecty = kx + 3In 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 ProjectEach 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



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Re: In the equation above, k is a constant. If y = 17 when x = 2 [#permalink]
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30 May 2016, 05:28
Bunuel wrote: The Official Guide for GMAT® Review, 13th Edition  Quantitative Questions Projecty = kx + 3In 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.
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Re: In the equation above, k is a constant. If y = 17 when x = 2 [#permalink]
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30 May 2016, 06:11
Bunuel wrote: The Official Guide for GMAT® Review, 13th Edition  Quantitative Questions Projecty = kx + 3In 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



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Re: In the equation above, k is a constant. If y = 17 when x = 2 [#permalink]
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20 Jun 2016, 15:47
The approach is right as seen above. But I doubt that this question is a 600 difficulty question. Maybe sub600 more obviously.
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