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-1 w/ fractions

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knyc
 Post subject: -1 w/ fractions
 Post Posted: Thu Feb 21, 2008 9:57 pm 
Can anyone please explain why:
3 - x/x - 3 = -1
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blue_lotus
 Post subject:
 Post Posted: Fri Feb 22, 2008 7:09 am 
L.H.S = (3-x)/(x-3)
Note 3 - x = -(-3 + x)
= -( x - 3) [ in addition and substraction you can always swap the numbers as long as they carry the sign associated with them ]

Therefore L.H.S = -(x-3)/(x-3)
= -1 ( for all x not equal to 3 )
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knyc
 Post subject: Thank you!
 Post Posted: Fri Feb 22, 2008 1:49 pm 
thank you so much. really helped!
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