document.write( "Question 858239: Solve the system of linear equations
\n" ); document.write( " -2x+4y-z =8
\n" ); document.write( " x+7y+2z=5
\n" ); document.write( " 3x+3y+3z=-3 PLZ EXPLAIN IN STEPS \n" ); document.write( "

Algebra.Com's Answer #517149 by mananth(16946) $\"\"$ $\"About$

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-2 x + 4 y + -1 z = 8 --------------1
\n" ); document.write( "1 x + 7 y + 2 z = 5 --------------2
\n" ); document.write( "3 x + 3 y + 3 z = -3 --------------3
\n" ); document.write( "
\n" ); document.write( "consider equation 1 &2 Eliminate y
\n" ); document.write( "Multiply 1 by -7
\n" ); document.write( "Multiply 2 by 4
\n" ); document.write( "we get
\n" ); document.write( "14 x + -28 y + 7 z = -56
\n" ); document.write( "4 x + 28 y + 8 z = 20
\n" ); document.write( "Add the two
\n" ); document.write( "18 x + 0 y + 15 z = -36 ------------- 4
\n" ); document.write( "consider equation 2 & 3 Eliminate y
\n" ); document.write( "Multiply 2 by -3
\n" ); document.write( "Multiply 3 by 7
\n" ); document.write( "we get
\n" ); document.write( "-3 x + -21 y + -6 z = -15
\n" ); document.write( "21 x + 21 y + 21 z = -21
\n" ); document.write( "Add the two
\n" ); document.write( "18 x + 15 z = -36 -------------5 5 \r
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\n" ); document.write( "\n" ); document.write( "the system has infinitely many or no solution \n" ); document.write( "

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