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...Matrices ch i system of linear equations in variables l find solutions by graphing math review part supply and demand curve ii basic ideas about to know a matrix maosheng xiong department mathematics hkust row operation r kr j iii gauss jordan elimination method solve systems v inverse eqns identity the corresponding augmented im mi m using get reduced form unique solution no innite number given square its satises how many degrees freedom mm application restrictions positive numbers may be required for some real world problems iv oforder b then d c ad bc rowoperation notall are invertible vi equation solver if is ax x vii leontief input output analysis technology n industry constructed example nal ab second column model z external therefore size so we only need calculate st nd needed hx k write down from...