INSTRUCTOR’,research,,expressedorimplied,,orarisingoutof,thefurnishing,performance,-©2012,2006,1997PearsonEducation,-Wesley,75ArlingtonStreet,Boston,,storedinaretrievalsystem,ortransmitted,inanyformorbyanymeans,electronic,mechanical,photocopying,recording,orotherwise,-13:978-0-321-38888-9ISBN-10:0-321-38888-:Thekeyexercisesare7(or11or12),19–22,,thesymbolsR1,R2,…,standforrow1(orequation1),row2(orequation2),+=57ª157º1.«»−−27xx12=−5¬−−−275¼xx12+=57ª157ºReplaceR2byR2+(2)R1andobtain:«»39x2=¬039¼xx12+=57ª157ºScaleR2by1/3:«»x2=3¬013¼x1=−8ª10−8ºReplaceR1byR1+(–5)R2:«»x2=3¬013¼Thesolutionis(x1,x2)=(–8,3),orsimply(–8,3).36xx12+=−3ª36−3º2.«»57xx12+=10¬5710¼xx12+=21−ª12−1ºScaleR1by1/3andobtain:«»57xx12+=10¬5710¼xx12+=21−ª121−ºReplaceR2byR2+(–5)R1:«»−315x2=¬0315−¼xx12+=21−ª12−1ºScaleR2by–1/3:«»x2=−5
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