SOLUTION: This is a solving a system of equations word problem using matrices !! Suppose you bought supplies for a party. Three rolls of streamers and 15 party hats cost $30. Later, you bo

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: This is a solving a system of equations word problem using matrices !! Suppose you bought supplies for a party. Three rolls of streamers and 15 party hats cost $30. Later, you bo      Log On


   

Question 1159501: This is a solving a system of equations word problem using matrices !!
Suppose you bought supplies for a party. Three rolls of streamers and 15
party hats cost $30. Later, you bought 2 rolls of streamers and 4 party hats for
$11. How much did each roll of streamers cost? How much did each party hat
cost?
Found 2 solutions by Boreal, greenestamps:
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
3S+15H=30
2S+4H=11
multiply top by -2 and bottom by 3 to eliminate S
-6S-30H=-60
6S+12H=33
-18H=-27
H=$1.50
2S=$5
S=$2.50 substituting into second
check in first $7.50+$22.50=$30.00
Each hat cost $1.50

Answer by greenestamps(13200) About Me  (Show Source):
You can put this solution on YOUR website!


Gauss-Jordan elimination?
Cramer's Rule?
or maybe something else?

Just specifying "using matrices" doesn't tell us what method of solution you want to use.