document.write( "Question 271363: Solve for X and Y in the following problems using either substitution or elimination methods. X + Y = 10, 3X + Y = 12 \n" ); document.write( "
Algebra.Com's Answer #198715 by checkley77(12844)\"\" \"About 
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3X+Y=12
\n" ); document.write( "-(X+Y=10)
\n" ); document.write( "----------------
\n" ); document.write( "2X=2
\n" ); document.write( "X=2/2
\n" ); document.write( "X=1 ANS.
\n" ); document.write( "3*1+Y=12
\n" ); document.write( "3+Y=12
\n" ); document.write( "Y=12-3
\n" ); document.write( "Y=9 ANS.
\n" ); document.write( "PROOF:
\n" ); document.write( "1+9=10
\n" ); document.write( "10=10
\n" ); document.write( "
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