Mathematics, 30.08.2019 01:30 mariahrmunoz01

1- determine as equiaçoes do sistema s de equaçao matricial $\left[\begin{array}{ccc}2& 1\\1& -3\\\end{array}\right]$ x $\left[\begin{array}{ccc}x\\y\\ \end{array}\right]$ = $\left[\begin{array}{ccc}9\\-13 \\\end{array}\right]$
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2- numa sala, as cadeiras tem 4 pernas e os banquinhos tem 3. o total de assentos e 10 e o total de pernas e 34. quantas cadeiras tem nessa sala ?
3- um clube promoveu uma festa com o objetivo de arrecadar fundos para a campanha de crianças carentes. no dia da festa compareceram 230 pessoas entre socios e nao-socios. o valor total arrecadado foi de rs2450 e todas as pessoas presentes pagaram ingresso o preço do ingresso foi rs10,00 para socios e rs15,00 para nao-socios. com base nesses dados, qual foi o numero de socios do clube presentes na festa ?

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1- determine as equiaçoes do sistema s de equaçao matricial [tex]\left[\begin{array}{ccc}2& 1\\1...

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