document.write( "Question 63441This question is from textbook
\n" ); document.write( ": Solve the system by substitution.
\n" ); document.write( " x + y = 12
\n" ); document.write( " y = 2x
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Algebra.Com's Answer #44191 by rchill(405)\"\" \"About 
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substitute 2x for y in the first equation and you get 3x=12 or x=4. That means that y=8. \n" ); document.write( "
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