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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.

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

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.

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

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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