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In the xy-plane, region R consists of all the points (x, y)

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Senior Manager
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In the xy-plane, region R consists of all the points (x, y) [#permalink] New post 05 Nov 2007, 10:30
00:00
A
B
C
D
E

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Q12:
In the xy-plane, region R consists of all the points (x, y) such that 2x + 3y = 6. Is the point
(r, s) in region R ?

(1) 3r + 2s = 6
(2) r = 3 and s = 2
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 [#permalink] New post 05 Nov 2007, 10:51
D

Isnt the answer very obvious

or am I missing something
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 [#permalink] New post 05 Nov 2007, 23:52
I think it's B

Statement 1 indicates that point(s,r) is in the region R. It doesn't say anything about point(r,s).
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 [#permalink] New post 06 Nov 2007, 00:23
(B) it is :)

The statment 1 flips the x and y... (r, s) is definied by 3r + 2s = 6 and R is 2x + 3y = 6 <=> 2r + 3s = 6.

So we have 1 point of intersection for the 2 lines that makes yes and all the other points of 3*x+2*y = 6 that are out :)

This is insufficient :)
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 [#permalink] New post 06 Nov 2007, 06:44
This question puzzled me too...

how do you define a region??? is it below the line or above the line?

unless we know what area the region covers..we cant say anything...

I would say the answer is E
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 [#permalink] New post 06 Nov 2007, 06:47
Fig wrote:
(B) it is :)

The statment 1 flips the x and y... (r, s) is definied by 3r + 2s = 6 and R is 2x + 3y = 6 <=> 2r + 3s = 6.

So we have 1 point of intersection for the 2 lines that makes yes and all the other points of 3*x+2*y = 6 that are out :)

This is insufficient :)


Fig, Can you pls. explain how one determines whether a point (r,s in this case) is in the same region as another point? Sure we can plot the rough graphs of both equations. But so what? Thanks.
  [#permalink] 06 Nov 2007, 06:47
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