document.write( "Question 1198509: Solve the system of equations.
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document.write( "X-2y+z=-3
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document.write( "-x+4y=10
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document.write( "2x-y+6z=7\r
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document.write( "The correct answer is one of the following. Which one?\r
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document.write( "A) no solution
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document.write( "B) x=2, y=3, z=1
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document.write( "C) x=-1, y=4,z=2
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document.write( "D) x=3, y=2, z=-1
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document.write( "E) x=-2, y=3, z=-4
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Algebra.Com's Answer #832122 by ikleyn(52798)![]() ![]() You can put this solution on YOUR website! .\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "The most straightforward way is to check given answers by substituting values into equations.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "The good strategy is to start from second equation, since it is shortest.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "So, substitute given values into second equation.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Quickly you will find that values (B) fit this equation.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "After that, check values (B) for the rest of equations.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Doing this way, you will get right answer quickly and without having any difficulties (without any headache).\r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "///////////////\r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "After seeing the solutions of other tutors, it is a mystery for me,\r \n" ); document.write( "\n" ); document.write( "why and for what reason do they agitate for 1000 tons of unnecessary calculations,\r \n" ); document.write( "\n" ); document.write( "when easy and a straightforward way lies on the surface and is just pointed.\r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |