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sujayb
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Pls. provide explanations. Thanks 06 Dec 2006, 08:41
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Pls. provide explanations. Thanks :)



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AK
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Pls. provide explanations. Thanks 06 Dec 2006, 10:18
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C

Both statement alone is not sufficient
but on subtracting (2) from (1) we get s= 3r +2 which proves (r,s) lies on y=3x +2
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sujayb
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Pls. provide explanations. Thanks 06 Dec 2006, 10:26
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AK
C

Both statement alone is not sufficient
but on subtracting (2) from (1) we get s= 3r +2 which proves (r,s) lies on y=3x +2
Show more


Can you elaborate a little bit more?

From (1), I get s = 3r + 2 or s = 4r + 9
From (2), I get s = 4r - 6 or s = 3r + 2

When we combine 1 & 2 , we get s = 3r + 2. Is this what you meant ?
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AK
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Pls. provide explanations. Thanks 06 Dec 2006, 10:47
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from (1)
(3r+2 -s)(4r +9 -s)= 0
on expanding it, we get

12*r^2 + s^2 - 7rs +35r - 11s + 18 = 0 ..... (a)

similarly expanding (2), we get

12*r^2 + s^2 - 7rs - 10 r +4s -12 = 0 ......(b)


now a - b will give

45*r - 15*s + 30 = 0

0r, s= 3r +2


given equation of line y= 3x+2

so we can say (r,s) lies on the line
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Pls. provide explanations. Thanks 06 Dec 2006, 11:04
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AK
from (1)
(3r+2 -s)(4r +9 -s)= 0
on expanding it, we get

12*r^2 + s^2 - 7rs +35r - 11s + 18 = 0 ..... (a)

similarly expanding (2), we get

12*r^2 + s^2 - 7rs - 10 r +4s -12 = 0 ......(b)


now a - b will give

45*r - 15*s + 30 = 0

0r, s= 3r +2


given equation of line y= 3x+2

so we can say (r,s) lies on the line
Show more


Thanks, AK. Does my method above seem plausible?
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AK
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Pls. provide explanations. Thanks 06 Dec 2006, 11:16
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sujayb
AK
C

Both statement alone is not sufficient
but on subtracting (2) from (1) we get s= 3r +2 which proves (r,s) lies on y=3x +2

Can you elaborate a little bit more?

From (1), I get s = 3r + 2 or s = 4r + 9
From (2), I get s = 4r - 6 or s = 3r + 2

When we combine 1 & 2 , we get s = 3r + 2. Is this what you meant ?
Show more


Your method is convincing ... this is the fastest way to solve



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!