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GMATprep y=mx+b

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GMATprep y=mx+b [#permalink]

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New post 11 Oct 2008, 18:38
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Re: GMATprep y=mx+b [#permalink]

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New post 11 Oct 2008, 21:04
spiridon wrote:
...


I got this same problem in my GMATPrep yesterday :)

y=3x+2 contains the point (r,s). So if we substitute x=r and y=s in the y=mx+c equation, the equation must hold true.

i.e. s=3r+2. So essentially the question is is s=3r+2 ?

(1) Gives us 2 values for s. ---> s = 3r+2 and s = 4r+9. Not suff.

(2) Gives us 2 values of s. ---> s = 3r + 2 and s = 4r-6. Not suff.

Combined we get. s = 3r + 2

So C.
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Re: GMATprep y=mx+b [#permalink]

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New post 12 Oct 2008, 12:01
amitdgr wrote:
spiridon wrote:
...


I got this same problem in my GMATPrep yesterday :)

y=3x+2 contains the point (r,s). So if we substitute x=r and y=s in the y=mx+c equation, the equation must hold true.

i.e. s=3r+2. So essentially the question is is s=3r+2 ?

(1) Gives us 2 values for s. ---> s = 3r+2 and s = 4r+9. Not suff.

(2) Gives us 2 values of s. ---> s = 3r + 2 and s = 4r-6. Not suff.

Combined we get. s = 3r + 2

So C.

IMO C
we need to substitute then find the answer !!
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Re: GMATprep y=mx+b   [#permalink] 12 Oct 2008, 12:01
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