国外原版美国加州中学教材5

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1、5SolvingSystemsofLinearEquations•Standard9.0Studentssolveasystemoftwolinearequationsintwovariablesalgebraicallyandareabletointerprettheanswergraphically.Studentsareabletosolveasystemoftwolinearinequalitiesintwovariablesandtosketchthesolutionsets.(Key,CAHSEE)KeyVocabu

2、laryelimination(p.266)substitution(p.260)systemofequations(p.253)FPOOVERMATTERReal-WorldLinkTREESThetallestredwoodtreesintheworldareinHumboldtCounty,California.Thetallestredwoodtreeis370feettall.Inidealconditions,aredwoodtreecouldgrowtoaheightof420feet.Theheightofthe

3、setreescanbemodeledbysystemsoflinearequations.SolvingSystemsofLinearEquationsMakethisFoldabletorecordinformationaboutsolvingsystemsofequationsandinequalities.Beginwithfivesheetsofgridpaper.1Foldeachsheetinhalf2Unfoldandcutfouralongthewidth.rowsfromleftsideofeachsheet

4、,fromthetoptothecrease.3Stackthesheets4Labeleachpageñ•¡Ê1À[…£¶∂õandstapletoformwithalessonnumberJÞÃÌá±ÃÊ∫î*µı[̶∫∂Ãabooklet.andtitle.J∫≠Û¶∂õÊJÞÃÌá±ÃÊ∫î:¶∂á[ÀÊ*µı[̶∫∂ÃÊ250Chapter5SolvingSystemsofLinearEquations2250-251COCH05-87785225050-251COCH05-877852250110/3/063:3

5、8:52PM0/3/063:38:52PMGETREADYforChapter5DiagnoseReadinessYouhavetwooptionsforcheckingPrerequisiteSkills.Option2TaketheOnlineReadinessQuizatca.algebra1.com.Option1TaketheQuickCheckbelow.RefertotheQuickReviewforhelp.Grapheachequation.(Lesson3-3)EXAMPLE11.y=12.y=-2xGrap

6、hy=_3x-3.43.y=4-x4.y=2x+3Step1They-interceptis-3.So,graph(0,-3).15.y=5-2x6.y=_2x+23vÀ¶õ£ÌÊôÊı∂¶ÌÃStep2Theslopeis_.47.HOUSESThenumberonCraig’shouseis7.From(0,-3),?uThenumbersofthehousesonhisblockmoveup3unitsı…ÊÎÊı∂¶ÌÃincreaseby2.Graphtheequationthatandright4units.äzÊ0

7、ήmodelsthehousenumbersonCraig’sDrawadot.block.Step3Drawtheline.SolveeachequationorformulafortheEXAMPLE2variablespecified.(Lesson2-8)2y2ySolve_=_forx.8.4x+a=6x,forx3s13x2y2y_=_Originalequation9.8a+y=16,fora3s13x2y·3s=2y·13xFindthecrossproducts.7bc-d10._=12,forb106ys=

8、26xySimplify.7m+n11._=2m,forq6ysq_=xDivideeachsideby26y.26y3s_=xSimplify.13Simplifyeachexpression.Ifnotpossible,EXAMPLE3writesimpli