document.write( "Question 1205753: Solve -3x+5y=21 and 6x-y=-15 \n" ); document.write( "
Algebra.Com's Answer #842761 by MathLover1(20850)\"\" \"About 
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\n" ); document.write( "\n" ); document.write( "\"-3x%2B5y=21\"......eq.1.....both sides multiply by \"2\"
\n" ); document.write( "\"6x-y=-15\"........eq.2
\n" ); document.write( "----------------------------
\n" ); document.write( "\"-6x%2B10y=42\"......eq.1
\n" ); document.write( "\"6x-y=-15\"........eq.2
\n" ); document.write( "--------------------------------add
\n" ); document.write( "\"-6x%2B10y%2B6x-y=42-15\"\r
\n" ); document.write( "\n" ); document.write( "\"9y=27\"\r
\n" ); document.write( "\n" ); document.write( "\"y=3\"\r
\n" ); document.write( "\n" ); document.write( "go to\r
\n" ); document.write( "\n" ); document.write( "\"6x-y=-15\"........eq.2, substitute \"y\"\r
\n" ); document.write( "\n" ); document.write( "\"6x-3=-15\"\r
\n" ); document.write( "\n" ); document.write( "\"6x=-15%2B3\"\r
\n" ); document.write( "\n" ); document.write( "\"6x=-12\"\r
\n" ); document.write( "\n" ); document.write( "\"x=-2\"\r
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