Chapter 4 Chp./ Sec. # Chp./Sec. Title URL 4 Systems of Linear Equations   4.1 Solving Systems by Graphing and Substitution http://www.cne.gmu.edu/modules/dau/calculus/graphing_funcs/glf_frm.html or http://www.xnet.com/~fidler/triton/math/review/mat085/linsys/two/ subst/subst1.htm 4.2 The Addition Method http://library.advanced.org/16284/a_equation_1.htm#System of Equations 4.3 Systems of Linear Equations in Three Variables http://www.alumni.caltech.edu/~chamness/equation/equation.html 4.4 Solving Linear Systems Using Matrices http://www.sosmath.com/matrix/system0/system0.html 4.5 Cramer's Rule for Systems in Two Variables http://sosmath.umcs.lublin.pl/matrix/determ2/determ2.html or http://www.ies.co.jp/math/java/renritsu/renritsu.html 4.6 Cramer's Rule for Systems in Three Variables No Links Available 4.7 Linear Programming http://www.me.utexas.edu/~jensen/addins/mp_add.dir/lp_add/lp_exam.html

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