Question

You are buying decorations for a birthday party. the before tax total for 3 rolls of crepe paper and 20 balloons is $11.40. after you start decorating, you need more supplies. you buy 2 more rolls of crepe paper and 10 more balloons for $7.20 before tax. how much did each cost?

please help with an explanation.

Answer 1

Answer & Step-by-step explanation:

Let's have

C = Creepers

B = Balloons

1) 6C + 20B = 11.9

2) 2C + 15B = 6.05

Eliminate

16C + 20B = 11.9 x3

-2C + 15B = 6.05 x4

18C + 60B = 35.7

-8C + 60B = 24.2

10C/10 = 11.5/10

C = 1.15