ࡱ> 796'` !bjbj .Z,DDDD$ "20T___J"L"L"L"L"L"L"$#he&p"_____p""_J"_J"!"$ `3bq<Du@!6""0"!,&&"&"$_______p"p"___"____ d D DD,( Systems of Linear Equations (Algebraically) (3 EMBED Equation.3 3) A system of linear equations can consist of two equations with two variables, three equations with three variables, four equations with four variables etc. To solve a system of three equations with three unknowns, means to find one value for each variable that will satisfy each of the equations. This process is usually done algebraically by using the process of elimination. The steps involved in solving a 3 EMBED Equation.3 3 system of linear equations algebraically are: Set up two pair of two equations and eliminate the same variable from each pair. There is now a 2 EMBED Equation.3 2 system of linear equations to solve. The equations can be solved using any of the known methods used to solve a 2 EMBED Equation.3 2 system. When the solution for the 2 EMBED Equation.3 2 system of linear equations has been determined, these numbers must be substituted into one of the original equations of the given system of linear equations. This new equation must be solved in order to find the value of the final variable. Example1: Solve the following system of linear equations algebraically:  EMBED Equation.3   EMBED Equation.3  EMBED Equation.3   EMBED Equation.3  EMBED Equation.3  EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3  EMBED Equation.3  EMBED Equation.3   EMBED Equation.3  These are the two pair of two equations. In each pair, the variable y has been eliminated. There is now a 2 EMBED Equation.3 2 system of linear equations which must be solved.  EMBED Equation.3   EMBED Equation.3  This 2 EMBED Equation.3 2 system is being solved by elimination.  EMBED Equation.3  EMBED Equation.3  EMBED Equation.3  EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3  The solution is (x, y, z) = (1,-2,-1). The answers for x and z were substituted into one of the equations of the system of linear equations. It makes no difference which equation you substitute the values into since the solution will satisfy all of the equations. A 3 EMBED Equation.3 3 system of linear equations can also be solved by using the inverse matrix method. Because this process is very long and cumbersome to do algebraically, it is normally done using a graphing calculator. Solving a 3 EMBED Equation.3 3 system using technology will be presented in the Appendix. Example 2: Solve the following system of linear equations algebraically:  EMBED Equation.3   EMBED Equation.3  EMBED Equation.3  EMBED Equation.3  EMBED Equation.3  EMBED Equation.3   EMBED Equation.3   EMBED Equation.3  EMBED Equation.3  EMBED Equation.3  EMBED Equation.3  EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3  EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3  EMBED Equation.3   EMBED Equation.3  The solution is (a, b, c) = (-2, -1, -3). Example 3: Solve the following system of linear equations algebraically:  EMBED Equation.3   EMBED Equation.3  EMBED Equation.3  EMBED Equation.3  EMBED Equation.3  EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3  EMBED Equation.3  EMBED Equation.3  EMBED Equation.3  EMBED Equation.3   EMBED Equation.3   EMBED Equation.3  EMBED Equation.3  EMBED Equation.3  EMBED Equation.3  EMBED Equation.3   EMBED Equation.3  Expressed as a decimal  EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3  The solution is (x, y, z)  EMBED Equation.3  (0.17, 1.71, 3.47). The above example has a solution in which the values are in decimal form. These answers are approximate values and this must be considered when the values are replaced for the variables in the system of equations. The results will be approximate and not exact. Example 4: Solve the following system of linear equations algebraically:  EMBED Equation.3   EMBED Equation.3   EMBED Equation.3  EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3  EMBED Equation.3   EMBED Equation.3  EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3  EMBED Equation.3   EMBED Equation.3  EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3  The solution is (r, s, t) = (3,-2, 2). ./BCDEI   , - . / T U g h »~q~dYj 2K hMUVjh6ahMEHUjh6ahMEHUj 2K hMCJUVaJjhMUjh6ahMEHUjN2K h6ahMUVjh6ahMU h6ahMhM$jhB1thM5CJEHUaJjN2K hMCJUVaJjhM5CJUaJhM5CJaJ,HI, } 9 ^ _ ab<B .Oh^hgdM & FgdMgdM$a$gdM!h i j _ j   ! " # $ % 8 9 : ; > ? 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