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The (x, y) pair (-1, 1) satisfies which of the following equations?

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The (x, y) pair (-1, 1) satisfies which of the following equations?  [#permalink]

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New post 17 Nov 2018, 09:38
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The \((x, y)\) pair \((-1, 1)\) satisfies which of the following equations?

I. \(2x^3 - y^2 = -3\)
II. \(2x^2 - y^3 = 1\)
III. \(x^2 - 2y^3 = -1\)

(A) I only
(B) I and II only
(C) I and III only
(D) II and III only
(E) I, II, and III


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Re: The (x, y) pair (-1, 1) satisfies which of the following equations?  [#permalink]

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New post 17 Nov 2018, 10:03
1
HKD1710 wrote:
The \((x, y)\)pair \((-1, 1)\) satisfies which of the following equations?

I. \(2x^3 - y^2 = -3\)
II. \(2x^2 - y^3 = 1\)
III. \(x^2 - 2y^3 = -1\)

(A) I only
(B) I and II only
(C) I and III only
(D) II and III only
(E) I, II, and III


Putting x = -1 and y = 1 in all equations
I. \(2x^3 - y^2 = -3\)
=> -2 - 1 = -3
=> -3 = -3
Satisfy

II. \(2x^2 - y^3 = 1\)
=> 2 - 1 = 1
=> 1 = 1
Satisfy

III. \(x^2 - 2y^3 = -1\)
=> 1 - 2 = -1
=> -1 = -1
Satisfy

All equations are satisfied

Answer choice (E)

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Re: The (x, y) pair (-1, 1) satisfies which of the following equations?  [#permalink]

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New post 17 Nov 2018, 10:21
\((-1, 1)\)

I. \(2 (1-)^3 - 1^2 = -3\) ---> -2-1 = -3 YES
II. \(2x^2 - y^3 = 1\) ----> 2(1)- 1 =1 YES
III. \(x^2 - 2y^3 = -1\) ----> 1 -2 (1) = -1 YES


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The (x, y) pair (-1, 1) satisfies which of the following equations?  [#permalink]

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New post 23 Jan 2019, 06:23
HKD1710 wrote:
The \((x, y)\) pair \((-1, 1)\) satisfies which of the following equations?

I. \(2x^3 - y^2 = -3\)
II. \(2x^2 - y^3 = 1\)
III. \(x^2 - 2y^3 = -1\)

(A) I only
(B) I and II only
(C) I and III only
(D) II and III only
(E) I, II, and III


Project PS Butler : Question #24


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Hi HKD1710

why in equation

I. \(2x^3 - y^2 = -3\)

\(- y^2\) = -1 and not +1?

I know there is some reason behind that but don't know what it is. Could you please assist.
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Re: The (x, y) pair (-1, 1) satisfies which of the following equations?  [#permalink]

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New post 23 Jan 2019, 10:56
Gmatprep550 wrote:
HKD1710 wrote:
The \((x, y)\) pair \((-1, 1)\) satisfies which of the following equations?

I. \(2x^3 - y^2 = -3\)
II. \(2x^2 - y^3 = 1\)
III. \(x^2 - 2y^3 = -1\)

(A) I only
(B) I and II only
(C) I and III only
(D) II and III only
(E) I, II, and III


Project PS Butler : Question #24


Subscribe to get Daily Email - Click Here | Subscribe via RSS - RSS


Hi HKD1710

why in equation

I. \(2x^3 - y^2 = -3\)

\(- y^2\) = -1 and not +1?

I know there is some reason behind that but don't know what it is. Could you please assist.


\(y=1\)

\(y^2 = 1^2\)

\(y^2 = 1\)

\(- y^2 = - 1\)
_________________

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Project PS Butler - https://gmatclub.com/forum/project-ps-butler-practice-everyday-280904.html
http://gmatclub.com/forum/information-on-new-gmat-esr-report-beta-221111.html
http://gmatclub.com/forum/list-of-one-year-full-time-mba-programs-222103.html

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Re: The (x, y) pair (-1, 1) satisfies which of the following equations?  [#permalink]

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New post 23 Jan 2019, 21:17
HKD1710 wrote:
Gmatprep550 wrote:
HKD1710 wrote:
The \((x, y)\) pair \((-1, 1)\) satisfies which of the following equations?

I. \(2x^3 - y^2 = -3\)
II. \(2x^2 - y^3 = 1\)
III. \(x^2 - 2y^3 = -1\)

(A) I only
(B) I and II only
(C) I and III only
(D) II and III only
(E) I, II, and III


Project PS Butler : Question #24


Subscribe to get Daily Email - Click Here | Subscribe via RSS - RSS


Hi HKD1710

why in equation

I. \(2x^3 - y^2 = -3\)

\(- y^2\) = -1 and not +1?

I know there is some reason behind that but don't know what it is. Could you please assist.


\(y=1\)

\(y^2 = 1^2\)

\(y^2 = 1\)

\(- y^2 = - 1\)



But \(- y^2\) also = - y * - y =- 1 * - 1 which = + 1 hence would like to know when to follow above method described by you. I am sure we will follow that if \(y^2\) would have provided in bracket for ex \(-(y^2)\)

Hope you are getting where I am getting confused.

Thanks !
_________________

______________________________
Press +1 Kudos if my post helped you a little and help me to ulcock the tests ;) Wish you all success

I'd appreciate learning about the grammatical errors in my posts


Please let me know if I'm wrong somewhere :-)

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User avatar
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Joined: 02 Sep 2009
Posts: 52907
The (x, y) pair (-1, 1) satisfies which of the following equations?  [#permalink]

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New post 23 Jan 2019, 21:22
Gmatprep550 wrote:
HKD1710 wrote:
Gmatprep550 wrote:
The \((x, y)\) pair \((-1, 1)\) satisfies which of the following equations?

I. \(2x^3 - y^2 = -3\)
II. \(2x^2 - y^3 = 1\)
III. \(x^2 - 2y^3 = -1\)

(A) I only
(B) I and II only
(C) I and III only
(D) II and III only
(E) I, II, and III



Hi HKD1710

why in equation

I. \(2x^3 - y^2 = -3\)

\(- y^2\) = -1 and not +1?

I know there is some reason behind that but don't know what it is. Could you please assist.


\(y=1\)

\(y^2 = 1^2\)

\(y^2 = 1\)

\(- y^2 = - 1\)



But \(- y^2\) also = - y * - y =- 1 * - 1 which = + 1 hence would like to know when to follow above method described by you. I am sure we will follow that if \(y^2\) would have provided in bracket for ex \(-(y^2)\)

Hope you are getting where I am getting confused.

Thanks !


No. \(-y^2=-(y*y)\). On the other hand \((-y)*(-y) = y^2\).
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Re: The (x, y) pair (-1, 1) satisfies which of the following equations?  [#permalink]

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New post 23 Jan 2019, 21:32
I am wondering why \(-1^2 = +1\) where as \(-Y^2 = -(Y*Y)\)?
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Re: The (x, y) pair (-1, 1) satisfies which of the following equations?  [#permalink]

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New post 23 Jan 2019, 22:15
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Re: The (x, y) pair (-1, 1) satisfies which of the following equations?  [#permalink]

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New post 23 Jan 2019, 22:28
simply plugin for x,y (-1,1) ; all options are valid
IMO E

HKD1710 wrote:
The \((x, y)\) pair \((-1, 1)\) satisfies which of the following equations?

I. \(2x^3 - y^2 = -3\)
II. \(2x^2 - y^3 = 1\)
III. \(x^2 - 2y^3 = -1\)

(A) I only
(B) I and II only
(C) I and III only
(D) II and III only
(E) I, II, and III


Project PS Butler : Question #24


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Re: The (x, y) pair (-1, 1) satisfies which of the following equations?   [#permalink] 23 Jan 2019, 22:28
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The (x, y) pair (-1, 1) satisfies which of the following equations?

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