document.write( "Question 410882: Suppose you bought supplies for a party. Three rolls of streamers and 15 balloons cost $30. Later, you bought 2 rolls of streamers and 4 baloons for $11. How much did each roll of streamers cost? How much did each balloon cost? (could you also explain how you got the answer?) \n" ); document.write( "
Algebra.Com's Answer #288854 by stanbon(75887)\"\" \"About 
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Three rolls of streamers and 15 balloons cost $30. Later, you bought 2 rolls of streamers and 4 baloons for $11. How much did each roll of streamers cost?
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\n" ); document.write( "Equations:
\n" ); document.write( "3s + 15b = 30 dollars
\n" ); document.write( "2s + 4b = 11 dollars
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\n" ); document.write( "Multiply thru 1st by 4
\n" ); document.write( "Multiply thru the 2nd by 15
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\n" ); document.write( "12s + 60b = 120
\n" ); document.write( "30s + 60b = 165
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\n" ); document.write( "Subtract and solve for \"s\":
\n" ); document.write( "18s = 45
\n" ); document.write( "s = 5/2 dollars
\n" ); document.write( "streamers cost $2.50
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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