Is x > y^2? (1) x > y+5 (2) x^2-y^2 = 0 : GMAT Data Sufficiency (DS)
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# Is x > y^2? (1) x > y+5 (2) x^2-y^2 = 0

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Is x > y^2? (1) x > y+5 (2) x^2-y^2 = 0 [#permalink]

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12 Jul 2010, 16:53
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Is x > y^2?

(1) x > y+5

(2) x^2-y^2 = 0

Hello,

I was wondering if someone can help with providing a detailed explanation as to how they arrived at correct answer . The explanation on the test (GMAT Club Test m2#19) review is a bit brief. Thanks
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Re: Is x > y^2? (1) x > y+5 (2) x^2-y^2 = 0 [#permalink]

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12 Jul 2010, 18:39
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tonebeeze wrote:
Hello,

I was wondering if someone can help with providing a detailed explanation as to how they arrived at (c). The explanation on the test review is a bit brief. Thanks

Is x>y^2?

(1) x>y+5

(2) x^2-y^2 = 0

Is $$x>y^2$$?

(1) $$x>y+5$$ --> $$x-y>5$$. Clearly insufficient, for example: if $$x=1$$ and $$y=-10$$ then the answer is NO, but if $$x=10$$ and $$y=1$$ then the answer is YES. Two different answers, hence not sufficient.

(2) $$x^2-y^2=0$$ --> $$(x-y)(x+y)=0$$ --> so either $$x-y=0$$ or $$x+y=0$$. Also insufficient: if $$x=1$$ and $$y=1$$, then answer is NO, buy if $$x=\frac{1}{2}$$ and $$y=\frac{1}{2}$$, then the answer is YES. Two different answers, hence not sufficient.

(1)+(2) As from (1) $$x-y>5\neq{0}$$, then from (2) must be true that $$x+y=0$$ --> so $$x=-y$$ --> substitute $$x$$ in (1) --> $$-y-y>5$$ --> $$y<-\frac{5}{2}<0$$, as $$x=-y$$, then $$x>\frac{5}{2}>0$$, so $$y^2$$ (or which is the same $$x^2$$) will always be more than $$x$$, thus the answer to the question "Is $$x>y^2$$" is NO. Sufficient.

To elaborate more as $$x=-y>0$$, the only chance for $$x>y^2$$ to hold true (or which is the same for $$x>x^2$$ to hold true) would be if $$x$$ is fraction ($$0<x<1$$). For example if $$x=\frac{1}{2}$$ and $$y=-\frac{1}{2}$$ then $$x=\frac{1}{2}>y^2=\frac{1}{4}$$. But the fact that $$x>\frac{5}{2}>0$$ rules out this option.

Hope it's clear.
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Re: Is x > y^2? (1) x > y+5 (2) x^2-y^2 = 0 [#permalink]

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08 Jan 2012, 21:58
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Hi, there! I'm happy to help with this.

The question: is x > y^2

Statement #1: x > y + 5

This doesn't necessarily tell us anything. If y = 1, and x = 7, then x > y^2, but if y = -6 and x = 0, then x < y^2. But itself, Statement #1 is not sufficient.

Statement #2: x^2 - y^2 = 0

This means that x^2 = y^2, which means that x = ±y. Same absolute value, but both could be positive, both could be negative, or either one could be positive and the other negative. We know that y^2 will be positive, but the x can be positive or negative, so by itself, Statement #2 is insufficient.

Combined
Now, we know that x^2 - y^2 = 0 ---> x = ±y, AND we know that x > y + 5. This leads immediate to a few conclusions
(a) x is positive and y is negative --- that's the only way they could have the same absolute value, but with x bigger than y + 5
(b) x and y must have an absolute value greater than 2.5, so that the different between positive x and negative y is more than 5

So we are comparing a positive number x, greater than 2.5, to the square of the negative number with the same absolute value. Of course, x^2 and y^2 are equal, so the question really boils down to: given that x > 2.5, is x > x^2?

For all x greater than one, the square of x is greater than x. That's because, squaring is multiplying a number by itself, and when you multiply anything by a number greater than one, it gets bigger.

Thus, if x > 2.5, when we square it, it will get bigger. Therefore, x^2 = y^2 > x for all values of x > 2.5.

Thus, combined, the statements are sufficient together. Answer = C

Does that make sense? Please let me know if you have any questions.

Mike
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Re: Is x > y^2? (1) x > y+5 (2) x^2-y^2 = 0 [#permalink]

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07 Oct 2013, 22:15
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priyankakhosla wrote:

Statement two provides us with equation x^2=y^2

Doesn't that answer our question for x>y^2 as No always ?

For example if x=-2 and y=2 then -2 is not greater than y^2..
Or x=2 and y=2; 2 is not greater than 4 ?

Am i missing something here ?

P.S: Thanks in advance for the help !

If x and y are fractions for eg. x=1/2 and y=1/2
then 1/2 > 1/4 ; i.e. x > y^2 - Hence you get a YES answer here and statement 2 becomes Insufficient.

Consider Kudos if it helped.
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Re: Is x > y^2? (1) x > y+5 (2) x^2-y^2 = 0 [#permalink]

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07 Dec 2014, 01:18
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usre123 wrote:
Hello, could someone please remove the highlighted part from the original post? (also from my post now, I suppose).
Also, I just wanted to know, if we could also write $$x^2-y^2=0$$ as $$x^2=y^2$$ which is the same as $$|x|=|y|$$.
Just asking because I've become slightly comfortable with solving with absolute values. So is this ok?

yes, you can use $$x^2-y^2=0$$ as $$x^2=y^2$$ or $$|x|=|y|$$
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Re: Is x > y^2? (1) x > y+5 (2) x^2-y^2 = 0 [#permalink]

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12 Jul 2010, 19:13
Thanks! That was a much clear explanation.

Last problem of the day:

What is the best approach to solve problems such as this:

"How many times will the digit 7 be written when listing the integers from 1 to 1000?"

Is there any combinationatorics shortcuts? The GMTClub test approached seemed very time consuming.
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Re: Is x > y^2? (1) x > y+5 (2) x^2-y^2 = 0 [#permalink]

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15 Jul 2010, 07:33
tonebeeze wrote:
Thanks! That was a much clear explanation.

Last problem of the day:

What is the best approach to solve problems such as this:

"How many times will the digit 7 be written when listing the integers from 1 to 1000?"

Is there any combinationatorics shortcuts? The GMTClub test approached seemed very time consuming.

digits-problem-difficulty-in-gmat-club-test-97153.html
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Re: Is x > y^2? (1) x > y+5 (2) x^2-y^2 = 0 [#permalink]

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16 Jul 2013, 23:22
From 100 hardest questions
Bumping for review and further discussion.
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Re: Is x > y^2? (1) x > y+5 (2) x^2-y^2 = 0 [#permalink]

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18 Jul 2013, 18:33
Bunnel, can you please provide a graphical solution to this particular problem?
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Re: Is x > y^2? (1) x > y+5 (2) x^2-y^2 = 0 [#permalink]

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18 Jul 2013, 21:41
nitin6305 wrote:
Bunnel, can you please provide a graphical solution to this particular problem?

Not a good candidate for graphic approach.
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Re: Is x > y^2? (1) x > y+5 (2) x^2-y^2 = 0 [#permalink]

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07 Oct 2013, 11:06

Statement two provides us with equation x^2=y^2

Doesn't that answer our question for x>y^2 as No always ?

For example if x=-2 and y=2 then -2 is not greater than y^2..
Or x=2 and y=2; 2 is not greater than 4 ?

Am i missing something here ?

P.S: Thanks in advance for the help !
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Re: Is x > y^2? (1) x > y+5 (2) x^2-y^2 = 0 [#permalink]

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23 Nov 2014, 22:03
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Is x > y^2? (1) x > y+5 (2) x^2-y^2 = 0 [#permalink]

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07 Dec 2014, 00:29
Bunuel wrote:
tonebeeze wrote:
Hello,

I was wondering if someone can help with providing a detailed explanation as to how they arrived at (c). The explanation on the test review is a bit brief. Thanks

Is x>y^2?

(1) x>y+5

(2) x^2-y^2 = 0

Is $$x>y^2$$?

(1) $$x>y+5$$ --> $$x-y>5$$. Clearly insufficient, for example: if $$x=1$$ and $$y=-10$$ then the answer is NO, but if $$x=10$$ and $$y=1$$ then the answer is YES. Two different answers, hence not sufficient.

(2) $$x^2-y^2=0$$ --> $$(x-y)(x+y)=0$$ --> so either $$x-y=0$$ or $$x+y=0$$. Also insufficient: if $$x=1$$ and $$y=1$$, then answer is NO, buy if $$x=\frac{1}{2}$$ and $$y=\frac{1}{2}$$, then the answer is YES. Two different answers, hence not sufficient.

(1)+(2) As from (1) $$x-y>5\neq{0}$$, then from (2) must be true that $$x+y=0$$ --> so $$x=-y$$ --> substitute $$x$$ in (1) --> $$-y-y>5$$ --> $$y<-\frac{5}{2}<0$$, as $$x=-y$$, then $$x>\frac{5}{2}>0$$, so $$y^2$$ (or which is the same $$x^2$$) will always be more than $$x$$, thus the answer to the question "Is $$x>y^2$$" is NO. Sufficient.

To elaborate more as $$x=-y>0$$, the only chance for $$x>y^2$$ to hold true (or which is the same for $$x>x^2$$ to hold true) would be if $$x$$ is fraction ($$0<x<1$$). For example if $$x=\frac{1}{2}$$ and $$y=-\frac{1}{2}$$ then $$x=\frac{1}{2}>y^2=\frac{1}{4}$$. But the fact that $$x>\frac{5}{2}>0$$ rules out this option.

Hope it's clear.

Hello, could someone please remove the highlighted part from the original post? (also from my post now, I suppose).
Also, I just wanted to know, if we could also write $$x^2-y^2=0$$ as $$x^2=y^2$$ which is the same as $$|x|=|y|$$.
Just asking because I've become slightly comfortable with solving with absolute values. So is this ok?
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Re: Is x > y^2? (1) x > y+5 (2) x^2-y^2 = 0 [#permalink]

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07 Dec 2014, 03:20
thank you, and thank you for editing the questions I pointed out.
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Re: Is x > y^2? (1) x > y+5 (2) x^2-y^2 = 0 [#permalink]

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11 Dec 2015, 00:22
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Is x > y^2? (1) x > y+5 (2) x^2-y^2 = 0 [#permalink]

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13 Dec 2015, 03:29
Forget conventional ways of solving math questions. In DS, Variable approach is the easiest and quickest way to find the answer without actually solving the problem. Remember equal number of variables and independent equations ensures a solution.

Is x > y^2?

(1) x > y+5

(2) x^2-y^2 = 0

-> In the original condition, there are 2 variables(x, y), which should match with the number of equations. So, you need 2 equations. For 1) 1 equation, for 2) 1 equation, which is likely to make C the answer. In 1) & 2), it is x-y>5 for 1). In case of 2), x=y, x=-y. When x=y, it is 0>5 from x-y>5, which is impossible and becomes x=-y. Thus, x>y^2? --> -y>y^2? --> 0>y^2+y? --> 0>y(y+1)? --> -1<y<0?. In 1), -y>y+5, -5>2y, -5/2>y, -2.5>y, which is no and sufficient. Therefore, the answer is C.

During the exam, it is better to choose C since there are 2 variables.

-> For cases where we need 2 more equations, such as original conditions with “2 variables”, or “3 variables and 1 equation”, or “4 variables and 2 equations”, we have 1 equation each in both 1) and 2). Therefore, there is 70% chance that C is the answer, while E has 25% chance. These two are the majority. In case of common mistake type 3,4, the answer may be from A, B or D but there is only 5% chance. Since C is most likely to be the answer using 1) and 2) separately according to DS definition (It saves us time). Obviously there may be cases where the answer is A, B, D or E.
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Re: Is x > y^2? (1) x > y+5 (2) x^2-y^2 = 0   [#permalink] 13 Dec 2015, 03:29
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