document.write( "Question 508265: the sum of two numbers is 12 the difference of the same two numbers is negative four what are the numbers? \n" ); document.write( "

Algebra.Com's Answer #340903 by oberobic(2304) $\"\"$ $\"About$

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x + y = 12
\n" ); document.write( "so
\n" ); document.write( "x = 12 -y
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\n" ); document.write( "x - y = -4
\n" ); document.write( "so
\n" ); document.write( "x = y-4
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\n" ); document.write( "x=x
\n" ); document.write( "so
\n" ); document.write( "12-y = y -4
\n" ); document.write( "add y to both sides
\n" ); document.write( "12 = 2y -4
\n" ); document.write( "add 4 to both sides
\n" ); document.write( "16 = 2y
\n" ); document.write( "2y = 16
\n" ); document.write( "divide both sides by 2
\n" ); document.write( "y = 8
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\n" ); document.write( "x + y = 12
\n" ); document.write( "x + 8 = 12
\n" ); document.write( "x = 4
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\n" ); document.write( "Check using the other equation.
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\n" ); document.write( "\n" ); document.write( "x - y = ?
\n" ); document.write( "4 -8 = -4
\n" ); document.write( "Correct.
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\n" ); document.write( "Answer: y=8 and x=4
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\n" ); document.write( "Done.
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