Can't get it...

logitech: Legendary Member; Posts: 2134; Joined: Mon Oct 20, 2008 11:26 pm; Thanked: 237 times; Followed by:25 members; GMAT Score:730

Re: Can't get it...

by logitech » Fri Jan 09, 2009 7:38 pm

ajmoney09 wrote:If b Does not equal 1, what is the value of a in terms of b in (ab/a-b)=1

this means:

ab=a-b

or ab-a+b=0

a(b-1)+b=0

a(b-1)=-b

a=-b/b-1

a= b/1-b

This is why the stem says b is not equal to 1 because otherwise we will have

a=b/0 which is not defined.

LGTCH
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"DON'T LET ANYONE STEAL YOUR DREAM!"

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ajmoney09: Master | Next Rank: 500 Posts; Posts: 110; Joined: Sun May 25, 2008 3:45 pm

by ajmoney09 » Fri Jan 09, 2009 8:04 pm

Thanks you fellas.

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