document.write( "Question 103256: Translate to a system of equations and solve:\r
\n" ); document.write( "\n" ); document.write( "The sum of two numbers is 30. Their difference is 40. Find the numbers
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Algebra.Com's Answer #75142 by HyperBrain(694)\"\" \"About 
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Let x= the first no.
\n" ); document.write( " y= the other no.\r
\n" ); document.write( "\n" ); document.write( "(1)x+y=30
\n" ); document.write( "(2)x-y=40
\n" ); document.write( "From (2),
\n" ); document.write( "x=y+40, substituting this to (1),\r
\n" ); document.write( "\n" ); document.write( "y+40+y=30
\n" ); document.write( " 2y+40=30
\n" ); document.write( " 2y=-10
\n" ); document.write( " y=-5\r
\n" ); document.write( "\n" ); document.write( "Solving for x,
\n" ); document.write( "x-5=30
\n" ); document.write( " x=35
\n" ); document.write( "Therefore, the 2 nos. are 35 and -5
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