document.write( "Question 831286: solve using the substitution method r-7s=0 and 9r-2s=61 \n" ); document.write( "
Algebra.Com's Answer #501223 by Alan3354(69443)\"\" \"About 
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solve using the substitution method r-7s=0 and 9r-2s=61
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\n" ); document.write( "r-7s=0 --> r = 7s Sub for r in the other equation.
\n" ); document.write( "9r-2s=61
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