document.write( "Question 124954: I am confused can someone help? I need to solve each system by the substitution method and determine if they are independent, dependent, or inconsistent.\r
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Algebra.Com's Answer #91609 by chitra(359)![]() ![]() You can put this solution on YOUR website! The given equations are: \r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "2y = x + 6 ---------------(1) \r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "-3x + 2y = -2 --------------(2) \r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Substituting (1) in (2) we get: \r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "-3x + x + 6 = - 2\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "-2x = -2 - 6 \r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "-2x = -8 \r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "x = 4 \r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "By back substitution we get the \"y\" value: \r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "2y = 10 \r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "==> y = 5 \r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "So we observe that the line intersects at (4,5) for both the graphs. \r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Hence the given system of equations are Consistent & Dependent\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Thus the solution. \r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Here are the notes that will help you determine the category under which they fall.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "If the two equations describe the same line, and thus lines that intersect an infinite number of times, the system is dependent and consistent.\r \n" ); document.write( "\n" ); document.write( "If the two equations describe lines that intersect once, the system is independent and consistent.\r \n" ); document.write( "\n" ); document.write( "If the two equations describe parallel lines, and thus lines that do not intersect, the system is independent and inconsistent.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |