document.write( "Question 982010: 4x-y=5 4x+4y=-4 solve the linear system using subtraction \n" ); document.write( "
Algebra.Com's Answer #602879 by MathLover1(20850)\"\" \"About 
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\"4x-y=5\"......eq.1
\n" ); document.write( "\"4x%2B4y=-4+\"......eq.2
\n" ); document.write( "------------------------------subtract eq.2 from eq.1\r
\n" ); document.write( "\n" ); document.write( "\"4x-y-%284x%2B4y%29=5-%28-4%29\"\r
\n" ); document.write( "\n" ); document.write( "\"cross%284x%29-y-cross%284x%29-4y=5%2B4\"\r
\n" ); document.write( "\n" ); document.write( "\"-y-4y=9\"\r
\n" ); document.write( "\n" ); document.write( "\"-5y=9\"\r
\n" ); document.write( "\n" ); document.write( "\"y=9%2F-5\"\r
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\n" ); document.write( "\n" ); document.write( "find \"x\"\r
\n" ); document.write( "\n" ); document.write( "\"4x-%28-9%2F5%29=5\"......eq.1\r
\n" ); document.write( "\n" ); document.write( "\"4x%2B9%2F5=5\"\r
\n" ); document.write( "\n" ); document.write( "\"4x=5-9%2F5\"\r
\n" ); document.write( "\n" ); document.write( "\"4x=25%2F5-9%2F5\"\r
\n" ); document.write( "\n" ); document.write( "\"4x=16%2F5\"\r
\n" ); document.write( "\n" ); document.write( "\"x=%28cross%2816%294%2F5%29%2Fcross%284%29\"\r
\n" ); document.write( "\n" ); document.write( "\"x=4%2F5\"\r
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