SOLUTION: 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

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?)
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
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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Equations:
3s + 15b = 30 dollars
2s + 4b = 11 dollars
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Multiply thru 1st by 4
Multiply thru the 2nd by 15
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12s + 60b = 120
30s + 60b = 165
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Subtract and solve for "s":
18s = 45
s = 5/2 dollars
streamers cost $2.50
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Cheers,
Stan H.
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