document.write( "Question 339688: solve this equation by substitution y = 3x and x + y = 8 \n" ); document.write( "
Algebra.Com's Answer #243334 by Alan3354(69443)\"\" \"About 
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solve this equation by substitution y = 3x and x + y = 8
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\n" ); document.write( "x + y = 8
\n" ); document.write( "y = 3x
\n" ); document.write( "Sub for y in the 1st eqn
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