document.write( "Question 1181671: Solve by the substitution method. What is the solution to the system?
\n" ); document.write( "x-y=3
\n" ); document.write( "7x+3y=-19
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Algebra.Com's Answer #811580 by Boreal(15235)\"\" \"About 
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the top is also x=y+3
\n" ); document.write( "so the second is 7(y+3)+3y=-19
\n" ); document.write( "7y+21+3y=-19
\n" ); document.write( "10y=-40
\n" ); document.write( "y=-4
\n" ); document.write( "x=-1
\n" ); document.write( "-
\n" ); document.write( "check in second -7-12=-19
\n" ); document.write( "
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