document.write( "Question 146908: I need to sove using Cramer's Rule:
\n" ); document.write( "x+3y=21
\n" ); document.write( "10x-5y=0 \n" ); document.write( "
Algebra.Com's Answer #107603 by nerdybill(7384)\"\" \"About 
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x + 3y = 21
\n" ); document.write( "10x - 5y = 0
\n" ); document.write( ".
\n" ); document.write( "coefficient matrix:
\n" ); document.write( " 1 3
\n" ); document.write( "10 -5
\n" ); document.write( ".
\n" ); document.write( "determinant of coefficient matrix:
\n" ); document.write( "(1*-5) - (3*10) = -5 - 30 = -35
\n" ); document.write( ".
\n" ); document.write( "'x' matrix:
\n" ); document.write( "21 3
\n" ); document.write( " 0 -5
\n" ); document.write( ".
\n" ); document.write( "determinant of 'x' matrix:
\n" ); document.write( "(21*-5) - (0*3) = -105 - 0 = -105
\n" ); document.write( ".
\n" ); document.write( "'y' matrix:
\n" ); document.write( "1 21
\n" ); document.write( "10 0
\n" ); document.write( ".
\n" ); document.write( "determinant of 'y' matrix:
\n" ); document.write( "(1*0) - (10*21) = 0 - 210 = -210
\n" ); document.write( ".
\n" ); document.write( "x = \"det of x matrix\"/\"det of coef matrix\"
\n" ); document.write( "x = -105/-35 = 3
\n" ); document.write( ".
\n" ); document.write( "y = \"det of y matrix\"/\"det of coef matrix\"
\n" ); document.write( "y = -210/-35 = 6
\n" ); document.write( ".
\n" ); document.write( "Solution: (x,y)=(3,6) \n" ); document.write( "
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