Hi there,
I have looked at GMATfix for the worked solution to this problem. I am still having difficulty with the following step :
Is - y > y ?
rephrased this means, is y > 0
Can anybody show me why this is the case?
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Question ID 1273
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gmatmachoman
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- y > yRaginT wrote:Hi there,
I have looked at GMATfix for the worked solution to this problem. I am still having difficulty with the following step :
Is - y > y ?
rephrased this means, is y > 0
Can anybody show me why this is the case?
= -y -y>0
-2y >0
-y>0
multiply (-1) both sides
y <0
So the rephrase will be is y<0
OR
0 >y
which also means is Y<0 ??
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selango
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Ragin T,
Rephrasing make the equation easy to solve in DS questions.
Rephrasing is nothing but solving the variables on both side of operators,so that it can deduce into easy terms which make the testing scenario easy.
Often it involves cancelling the common variables on both sides or adding/subtracting the variables.
Once u solve more DS ques u ll b able to understand this technique
Rephrasing make the equation easy to solve in DS questions.
Rephrasing is nothing but solving the variables on both side of operators,so that it can deduce into easy terms which make the testing scenario easy.
Often it involves cancelling the common variables on both sides or adding/subtracting the variables.
Once u solve more DS ques u ll b able to understand this technique
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RaginT
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I don't think either of you have got this : the rephrase is definitely correct : is y > 0?
the full problem and solution is here : https://www.gmatfix.com/solution/1273
my thinking is this :
is - y > y ?
becomes 0 > y - (-y) (take the -y from the other side)
therefore 0 > -2y
therefore is 0 < y ? (flip the sign when the -2 goes over to the other side)
However my other approach gives the opposite answer! :
is - y > y ?
becomes - y -y > 0
or -2y > 0
therefore is y < 0 ? (flip the sign as the -2 is taken over to the other side)
Help!
the full problem and solution is here : https://www.gmatfix.com/solution/1273
my thinking is this :
is - y > y ?
becomes 0 > y - (-y) (take the -y from the other side)
therefore 0 > -2y
therefore is 0 < y ? (flip the sign when the -2 goes over to the other side)
However my other approach gives the opposite answer! :
is - y > y ?
becomes - y -y > 0
or -2y > 0
therefore is y < 0 ? (flip the sign as the -2 is taken over to the other side)
Help!
-
selango
- Legendary Member
- Posts: 1460
- Joined: Tue Dec 29, 2009 1:28 am
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RaginT wrote:I don't think either of you have got this : the rephrase is definitely correct : is y > 0?
the full problem and solution is here : https://www.gmatfix.com/solution/1273
my thinking is this :
is - y > y ?
becomes 0 > y - (-y) (take the -y from the other side)
therefore 0 > -2y-->Here its wrong..it should be 0>2y and y<0
therefore is 0 < y ? (flip the sign when the -2 goes over to the other side)
However my other approach gives the opposite answer! :
is - y > y ?
becomes - y -y > 0
or -2y > 0
therefore is y < 0 ? (flip the sign as the -2 is taken over to the other side)
Help!
-
gmatmachoman
- Legendary Member
- Posts: 2326
- Joined: Mon Jul 28, 2008 3:54 am
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@Ragin Tselango wrote:RaginT wrote:I don't think either of you have got this : the rephrase is definitely correct : is y > 0?
the full problem and solution is here : https://www.gmatfix.com/solution/1273
my thinking is this :
is - y > y ?
becomes 0 > y - (-y) (take the -y from the other side)
therefore 0 > -2y-->Here its wrong..it should be 0>2y and y<0
therefore is 0 < y ? (flip the sign when the -2 goes over to the other side)
However my other approach gives the opposite answer! :
is - y > y ?
becomes - y -y > 0
or -2y > 0
therefore is y < 0 ? (flip the sign as the -2 is taken over to the other side)
Help!
CHeck my previous post.that shuld help u!
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Patrick_GMATFix
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is -y>y should be rephrased to y < 0?RaginT wrote:Hi there,
I have looked at GMATfix for the worked solution to this problem. I am still having difficulty with the following step :
Is - y > y ?
rephrased this means, is y > 0
Can anybody show me why this is the case?
just add y to both sides to get is 0 > 2y, then divide both sides by 2 to get is 0 > y?
Thank you for reporting this mistake. If you see anything similar in the future, please hit "Report Error" next to the solution. Sorry about the confusion
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Patrick_GMATFix
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Thank you selango. Problem has been fixed.selango wrote:I checked the solution in GMAT fix.
1) -y>y should be rephrased to y<0
2) -y<y should be rephrased to y>0
But in the solution its got swapped.
- Check out my site: GMATFix.com
- To prep my students I use this tool >> (screenshots, video)
- Ask me about tutoring.
