If a, b, c, and f are four nonzero numbers then all of the following proportions are equivalent EXCEPT

a)

b)

c)

d)

e)

Can someone please show me the steps? Does nonzero numbers simply mean numbers that can't equal to zero?

Thanks in advance

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- Sep 22nd 2008, 10:49 PMfabxxNonzero numbers? Thanks to Jameson!
If a, b, c, and f are four nonzero numbers then all of the following proportions are equivalent EXCEPT

a)

b)

c)

d)

e)

Can someone please show me the steps? Does nonzero numbers simply mean numbers that can't equal to zero?

Thanks in advance - Sep 22nd 2008, 10:51 PMJameson
I think there's a big chunk of the problem missing :)

- Sep 22nd 2008, 11:15 PMJameson
Yes, non-zero simply means not 0.

Let's start by finding two which ARE equal. Look at D) and E).

Cross multiply C) and you get af=cb. Do you know how to cross multiply? Now for E) multiply everything by bc and you get af=cb. So, good we've found two that match and a true statement to compare others to. Cross multiply C) and you get... af=cb, good. B) do the same thing and we get ... af=cb, awesome.

Now for A), cross multiply and we get ac=bf. UH OH. Found the different one.