Request: @bthemesandtricks would like to know if you have seen this formula before in another guise and if you will proof it for errors. He is new to OpenStudy.
Thanks.
http://openstudy.com/study#/updates/5063e61be4b0da5168be031b

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Thank for this favor

its cramer's rule.
that u derived.

see application section
http://en.wikipedia.org/wiki/Cramer's_rule

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