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In a rectangular coordinate system, are the points (a,b) and

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In a rectangular coordinate system, are the points (a,b) and [#permalink] New post 15 Nov 2008, 14:56
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A
B
C
D
E

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In a rectangular coordinate system, are the points (a,b) and (c,d) equidistant from the origin?

(1) (a/b) = (c/d)

(2) sqrt(a^2) + sqrt(b^2) = sqrt(c^2) + sqrt(d^2)
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Re: DS: Coordinate [#permalink] New post 15 Nov 2008, 15:37
tarek99 wrote:
In a rectangular coordinate system, are the points (a,b) and (c,d) equidistant from the origin?

(1) (a/b) = (c/d)

(2) sqrt(a^2) + sqrt(b^2) = sqrt(c^2) + sqrt(d^2)


Q is asking whether

sqrt (a^2+b^2) = sqrt (c^2+d^2) or a^2 + b ^2= c^2+d^2

1 says ad=bc Insuff

2 says a+b = c+d meansa^2 + b ^2 + 2ab = c^2+d^2 +2cd

Insufficient

Together with ad=bc and a+b = c+d cannot arrive at sqrt (a^2+b^2) = sqrt (c^2+d^2) or a^2 + b ^2= c^2+d^2

E
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Re: DS: Coordinate [#permalink] New post 15 Nov 2008, 20:20
tarek99 wrote:
In a rectangular coordinate system, are the points (a,b) and (c,d) equidistant from the origin?

(1) (a/b) = (c/d)
(2) sqrt(a^2) + sqrt(b^2) = sqrt(c^2) + sqrt(d^2)


My intution says C.

Cuz if a/b = c/d and sqrt(a^2) + sqrt(b^2) = sqrt(c^2) + sqrt(d^2), either a or b = either c or d.

Does anybody has any example where they are not equal?
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Re: DS: Coordinate [#permalink] New post 15 Nov 2008, 22:17
i think E is the ans.

v cannot take them proportionate or equal if we are not given values..
values can be anything...like

1+ 3 = 2 + 2..

pls enlighten..
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Re: DS: Coordinate [#permalink] New post 15 Nov 2008, 23:46
bindrakaran001 wrote:
i think E is the ans.

v cannot take them proportionate or equal if we are not given values..
values can be anything...like

1+ 3 = 2 + 2..

pls enlighten..


how do you make the ratio equal?
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Re: DS: Coordinate [#permalink] New post 16 Nov 2008, 20:28
icandy wrote:
tarek99 wrote:
In a rectangular coordinate system, are the points (a,b) and (c,d) equidistant from the origin?

(1) (a/b) = (c/d)

(2) sqrt(a^2) + sqrt(b^2) = sqrt(c^2) + sqrt(d^2)


Q is asking whether

sqrt (a^2+b^2) = sqrt (c^2+d^2) or a^2 + b ^2= c^2+d^2

1 says ad=bc Insuff

2 says a+b = c+d meansa^2 + b ^2 + 2ab = c^2+d^2 +2cd

Insufficient

Together with ad=bc and a+b = c+d cannot arrive at sqrt (a^2+b^2) = sqrt (c^2+d^2) or a^2 + b ^2= c^2+d^2

E


Agree with E with exact same reasoning
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Re: DS: Coordinate [#permalink] New post 16 Nov 2008, 20:36
icandy wrote:
tarek99 wrote:
In a rectangular coordinate system, are the points (a,b) and (c,d) equidistant from the origin?

(1) (a/b) = (c/d)

(2) sqrt(a^2) + sqrt(b^2) = sqrt(c^2) + sqrt(d^2)


Q is asking whether

sqrt (a^2+b^2) = sqrt (c^2+d^2) or a^2 + b ^2= c^2+d^2

1 says ad=bc Insuff

2 says a+b = c+d meansa^2 + b ^2 + 2ab = c^2+d^2 +2cd

Insufficient

Together with ad=bc and a+b = c+d cannot arrive at sqrt (a^2+b^2) = sqrt (c^2+d^2) or a^2 + b ^2= c^2+d^2

E


I think it is C
Continuing from where you left
a/b = c/d
a/b +1 = c/d +1
a+b/b = c+d/d
since a+b = c+d
b = d, similaryly a = c
So, yes they are equidistant
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Re: DS: Coordinate [#permalink] New post 16 Nov 2008, 22:48
LiveStronger wrote:
icandy wrote:
tarek99 wrote:
In a rectangular coordinate system, are the points (a,b) and (c,d) equidistant from the origin?

(1) (a/b) = (c/d)

(2) sqrt(a^2) + sqrt(b^2) = sqrt(c^2) + sqrt(d^2)


Q is asking whether

sqrt (a^2+b^2) = sqrt (c^2+d^2) or a^2 + b ^2= c^2+d^2

1 says ad=bc Insuff

2 says a+b = c+d meansa^2 + b ^2 + 2ab = c^2+d^2 +2cd

Insufficient

Together with ad=bc and a+b = c+d cannot arrive at sqrt (a^2+b^2) = sqrt (c^2+d^2) or a^2 + b ^2= c^2+d^2

E


I think it is C
Continuing from where you left
a/b = c/d
a/b +1 = c/d +1
a+b/b = c+d/d
since a+b = c+d
b = d, similaryly a = c
So, yes they are equidistant


You are correct! I am with C now...
Lesson learnt: do not leave calculation in between!!!

By the way , a/b +1 = c/d +1 this was bit tricky.
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Re: DS: Coordinate [#permalink] New post 17 Nov 2008, 07:37
I think that there is even a better way of looking at this problem. First of all, let's start with statement 1:

(1) ratios can never determine the exact values. They might both be equal or they might not be. For example:

1/2 = 5/10

They are both the same ratio, but they are not necessarily the same value. So not suff.

(2) The different numbers that we can use is really infinite here. For example:

5 + 5 = 10 or

9 + 1 = 10 and I can just come up with MANY other different combination

(1&2)

when both the ratios of a/b and c/d are the same and the sum of a & b is the same as that of c & d, then they both have equal value.

Therefore C
Re: DS: Coordinate   [#permalink] 17 Nov 2008, 07:37
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