math

Show that the given proportions are equivalent.

a+c / b+d = a-c / d-b

and a / b = c / d

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asked by Anna-Marie
  1. are u sure it's a-c/d-b for the 2nd term??

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    posted by mk-tintin
  2. a/b=c/d
    ->ad=bc

    a+c / b+d = a-c / b-d
    ->(a+c)(b-d)=(a-c)(b+d)
    ->ab+cb-ad-dc=ab+ad-cb-cd
    ->2ad=2bc
    so the given proportions are equivalent

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    posted by mk-tintin
  3. whoops did it again lol.. no its a-c / b-d ...but i still don't know how to do it

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    posted by Anna-Marie
  4. do u understand my answer??

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    posted by mk-tintin
  5. yeah i get it.. thanks some times i have brain farts and once i see it written out im like.. oh i should have known that. thanks again!!

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    posted by Anna-Marie

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