proof why we can cross-multiply
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Uploaded by schoolallover on Mar 19, 2008
algebraic proof of why cross-multiplication is allowed
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@How2Q I'm not so sure why this guy went into such a long-winded explanation. All you do is multiply both sides by both denominators so that you cancel off the denominators and you're left with the numerators times what was originally the denominator of the the other side.
PerfectPotion 11 months ago