Question 1

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Resolent el sistema per substitució, determina en quin punt es tallen les dues rectes d'equacions: 
begin mathsize 12px style bold r bold identical to open curly brackets table row cell bold x bold equals begin bold style 5 times k plus 4 end style end cell row cell bold y bold equals begin bold style negative 3 times k minus 1 end style end cell end table close curly brackets end style  i  begin mathsize 12px style bold italic s bold identical to begin bold style 6 times x plus 5 times y minus 33 equals 0 end style end style?
Format de la resposta: 

a) Valor de k=-2/3 (simplificat)

b) Punt =(2/3,-1/3) simplificat i entre parèntesis.

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