SOLUTION: suppose you buy supplies for a party three rolls of streamers and 15 party hats cost $30 later you bought 2 rolls of streamers and for party hats for $11 right and solve a system o

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: suppose you buy supplies for a party three rolls of streamers and 15 party hats cost $30 later you bought 2 rolls of streamers and for party hats for $11 right and solve a system o      Log On


   

Question 1019553: suppose you buy supplies for a party three rolls of streamers and 15 party hats cost $30 later you bought 2 rolls of streamers and for party hats for $11 right and solve a system of equations to determine the cross of streamers and party find their costs
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
suppose you buy supplies for a party three rolls of streamers and 15 party hats cost $30 later you bought 2 rolls of streamers and four party hats for $11 right and solve a system of equations to determine the cost of streamers and party hats: find their costs
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Equations:
3s + 15h = 30 dollars
2s + 4h = 11 dollars
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Modify for elimination::
6s + 30h = 60
6s + 12h = 33
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Subtract and solve for "h"::
18h = 27
h = 3/2 = $1.50 (cost of one hat)
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Solve for "s"::
3s + 15h = 30
3s + 15(3/2) = 30
3s +22.5 = 30
3s = 7.5
s = $2.50 (cost of one streamer)
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Cheers,
Stan H.
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