Alana is having a party. She bought 3 rolls of streamers and 2 packages of balloons for $10.00. She realized she needed more supplies and went back to the store and bought 2 more rolls of streamers and 1 more package of balloons for $6.25. How much did each roll of streamers and each package of balloons cost?

3 rolls of steamer + 2 packages of balloons = $10 -------------- (1)
2 rolls of steamer  + 1 package of balloons = $6.25     --------- (2)

(2) x 2:
4 rolls of steamer  + 2 package of balloons = $12.50  --------- (2a)

(2a) - (1):
1 roll of steamer = $2.50 ----------- Sub into (1)
3 ($2.50)  + 2 packages of balloons = $10
$7.50 + 2 packages of balloons = $10
2 packages of balloons = $10 - $7.50
2 packages of balloons = $2.50
1 packages of balloons = $1.25

1 packages of balloons = $1.25
1 roll of steamer = $2.50 

1 packages of balloons + 1 roll of steamer = $1.25 + $2.50 = $3.75