document.write( "Question 785698: solve the system by elimination
\n" ); document.write( "x+2y=9
\n" ); document.write( "3x-y=-15 \n" ); document.write( "
Algebra.Com's Answer #477680 by waynest(281)\"\" \"About 
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3(x + 2y) = 3(9)\r
\n" ); document.write( "\n" ); document.write( " 3x + 6y = 27 subtract the other equation from this one.
\n" ); document.write( "-(3x - y = -15)
\n" ); document.write( " 7y = 42
\n" ); document.write( "7y/7 = 42/7
\n" ); document.write( "y = 6\r
\n" ); document.write( "\n" ); document.write( "x + 2(6) = 9
\n" ); document.write( "x + 12 = 9
\n" ); document.write( "x = 9 -12
\n" ); document.write( "x = -3\r
\n" ); document.write( "\n" ); document.write( "check:
\n" ); document.write( "3(-3) - 6 = -15
\n" ); document.write( "-9 -6 = -15
\n" ); document.write( "-15 = -15\r
\n" ); document.write( "\n" ); document.write( "-3 + 2(6) = 9
\n" ); document.write( "-3 + 12 = 9
\n" ); document.write( "9 = 9
\n" ); document.write( " \n" ); document.write( "
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