document.write( "Question 220249: Solving using matrices: \r
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document.write( "3x+5y+2z=3
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document.write( "-x-y-z=-2
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document.write( "2x-2y+5z=11 \n" );
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Algebra.Com's Answer #165747 by Alan3354(69443)![]() ![]() You can put this solution on YOUR website! 3x+5y+2z=3 \n" ); document.write( "-x-y-z=-2 \n" ); document.write( "2x-2y+5z=11 \n" ); document.write( "------------ \n" ); document.write( "Det: \n" ); document.write( "3(-5-2) -5(-5+2) + 2(2+2) = -21 + 15 + 8 \n" ); document.write( "Det = 2 \n" ); document.write( "-------- \n" ); document.write( "x: \n" ); document.write( "5(-11+10) - 2(-11-4) + 3(-5-2) = -5 + 30 - 21 = 4 \n" ); document.write( "x = 4/Det = 4/2 \n" ); document.write( "x = 2 \n" ); document.write( "------ \n" ); document.write( "-y: \n" ); document.write( "3(-11+10) -2(-11+4) +3(-5+2) = -3 +14 -9 = 2 \n" ); document.write( "y = -1 \n" ); document.write( "------ \n" ); document.write( "z: \n" ); document.write( "3(-11-4) -5(-11+4) + 3(2+2) = -45 +35 +12 = 2 \n" ); document.write( "z = 1 \n" ); document.write( "--------- \n" ); document.write( "3x+5y+2z=3 --> 6 - 5 + 2 = 3 \n" ); document.write( "-x-y-z=-2 ---> -2 + 1 - 1 = -2 \n" ); document.write( "2x-2y+5z=11 --> 4 + 2 + 5 = 11 \n" ); document.write( "It checks \n" ); document.write( "Any questions, email me at gsihoutx@aol.com \n" ); document.write( " |