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you buy 1 balloon and 1 banner for $4. your friend buys 3 balloons and 2 banners for $9.

each ballon costs: ?
each banner costs: ?

Respuesta :

samia81

Answer:

each balloon costs 1$ and each banner costs 3$

Step-by-step explanation:

Answer:

Balloon = $1

Banner = $3

Step-by-step explanation:

a = balloon

b = banner

a + b = 4

3a + 2b = 9

b = -a + 4

3a + 2(-a + 4) = 9

3a - 2a + 8 = 9

a + 8 = 9

a = 1

a + b = 4

(1) + b = 4

b = 3

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