document.write( "Question 473862: solving systems of equations\r
\n" ); document.write( "\n" ); document.write( "solve the system of equation\r
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\n" ); document.write( "\n" ); document.write( "{ x+y=7
\n" ); document.write( " x-y=13\r
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\n" ); document.write( "\n" ); document.write( "i know the answer is (10, -3)\r
\n" ); document.write( "\n" ); document.write( "my question is how? can someone show me a step by step on how to do this?
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Algebra.Com's Answer #325001 by Alan3354(69443)\"\" \"About 
You can put this solution on YOUR website!
x+y=7
\n" ); document.write( "x-y=13
\n" ); document.write( "--------- Add
\n" ); document.write( "2x = 20
\n" ); document.write( "x = 10
\n" ); document.write( "------
\n" ); document.write( "y = -3
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