document.write( "Question 176914This question is from textbook
\n" ); document.write( ": Solve this system using Cramer's rule
\n" ); document.write( "\"system%285x-12y=4%2C+4x-7y=-2%29\"
\n" ); document.write( " \n" ); document.write( "
Algebra.Com's Answer #131972 by Edwin McCravy(20086)\"\" \"About 
You can put this solution on YOUR website!
Edwin's solution:
\n" ); document.write( "
\r\n" );
document.write( "\"system%285x-12y+=+4%2C4x-7y=-2%29\"\r\n" );
document.write( "\r\n" );
document.write( "Write this:\r\n" );
document.write( "\r\n" );
document.write( " and \r\n" );
document.write( "\r\n" );
document.write( "First fill in both denominators with the\r\n" );
document.write( "coefficients as they appear left of the equal signs, like this\"matrix%282%2C2%2C5%2C-12%2C4%2C-7%29\"\r\n" );
document.write( "\r\n" );
document.write( " and \r\n" );
document.write( "\r\n" );
document.write( "Now since \"x\" appears FIRST in the problem, fill in\r\n" );
document.write( "the FIRST column for x with the numbers on the right of the\r\n" );
document.write( "equal sign, namely these: \"matrix%282%2C1%2C4%2C-2%29\"\r\n" );
document.write( "\r\n" );
document.write( " and \r\n" );
document.write( "\r\n" );
document.write( "Now since \"y\" appears SECOND in the problem, fill in\r\n" );
document.write( "the SECOND column for y with the numbers on the right of the\r\n" );
document.write( "equal sign, namely these: \"matrix%282%2C1%2C4%2C-2%29\"\r\n" );
document.write( "\r\n" );
document.write( " and \r\n" );
document.write( "\r\n" );
document.write( "Complete the determinants by bringing the columns below up\r\n" );
document.write( "to the top:\r\n" );
document.write( "\r\n" );
document.write( " and \r\n" );
document.write( "\r\n" );
document.write( "To evaluate \"abs%28matrix%282%2C2%2CA%2CB%2CC%2CD%29%29\", use this formula.\r\n" );
document.write( "which amounts to subtracting the diagonal products:\r\n" );
document.write( "\r\n" );
document.write( " \"abs%28matrix%282%2C2%2CA%2CB%2CC%2CD%29%29+=+AD+-+BC\" \r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "Now for y.  We only have to do the top\r\n" );
document.write( "determinant because we have already done\r\n" );
document.write( "the bottom determinant, and found it to be 13, so\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "Edwin
\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
\n" );