document.write( "Question 374212: what is the addition method if possible?
\n" ); document.write( "3x+9y=9
\n" ); document.write( "-x+5y=-3
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Algebra.Com's Answer #266324 by dondon(1)\"\" \"About 
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3x + 9y = 9 (number this equation as equation i)
\n" ); document.write( "-x + 5y = -3 (number this equation as equation ii)\r
\n" ); document.write( "\n" ); document.write( "Now multiply equation ii) by 3 which gives:\r
\n" ); document.write( "\n" ); document.write( "-3x + 15y = -9 (number this equation as equation iii)\r
\n" ); document.write( "\n" ); document.write( "Now add equation i) and equation iii) which gives:\r
\n" ); document.write( "\n" ); document.write( " 24y = 0
\n" ); document.write( "=> y = 0\r
\n" ); document.write( "\n" ); document.write( "Now plug this obtained value of y in any of equation i) or ii) to get value of x:
\n" ); document.write( "plugging in i)\r
\n" ); document.write( "\n" ); document.write( " 3x + 9(0) = 9
\n" ); document.write( "=> 3x = 9
\n" ); document.write( "=> x = 3\r
\n" ); document.write( "\n" ); document.write( "so we get x = 3 & y = 0 as the answer.
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