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Define your variables: c = Cookie: $1              b = Pumkin Bread: $2

Equation:

Lady Gaga: 12c + 4b = 20

Katy Perry: 6c + 3b = 12

Step-by-step explanation:

Lady Gaga: 12c + 4b = 20

Katy Perry: 6c + 3b = 12

Solve using elimination

12c(-3) + 4b(-3) = 20(-3)

6c(4) + 3b(4) = 12(4)

-36c -12b = -60

24c + 12b = 48

-12c = -12

c = 1 (1 cookie is $1)

if we plug in 1 for c in Lady Gaga’s equation:

12(1) + 4b = 20

12 + 4b = 20

4b = 8

b = 2 (1 pumpkin bread is $2)

Define your variables: c = Cookie: $1              b = Pumkin Bread: $2

Equation:

Lady Gaga: 12c + 4b = 20

Katy Perry: 6c + 3b = 12