document.write( "Question 44009: Suppose x and y satisfy both of follwing equations below. Then y = ?
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document.write( "x-3y=7 and 2x+4y=5\r
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document.write( "Thanks. \n" );
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Algebra.Com's Answer #28941 by adamchapman(301)![]() ![]() ![]() You can put this solution on YOUR website! x-3y=7 ..1 \n" ); document.write( "2x+4y=5 ..2 \n" ); document.write( "Rearrange equation (..1): \n" ); document.write( "x=3y+7 ..3 \n" ); document.write( "Substitute equation (..3) into equation (..2) for x: \n" ); document.write( "2(3y+7)+4y=5 \n" ); document.write( "6y+14+4y=5 \n" ); document.write( "10y+14=5 \n" ); document.write( "10y=-9 \n" ); document.write( "y=-0.9 ..4 \n" ); document.write( "Substitute equation (..4) into equation (..3) for y: \n" ); document.write( "x=-2.7+7 \n" ); document.write( "x=4.3\r \n" ); document.write( "\n" ); document.write( "I hope this helps.\r \n" ); document.write( "\n" ); document.write( "P.S. I am trying to start up my own homework help website. I would be extremely grateful if you would send me your feedback on my help to adam.chapman@student.manchester.ac.uk \n" ); document.write( " |