Janet, Rose, and Tanya buy postcards from their favorite souvenir shop. Janet buys 3 postcards for &1.05. Rose buys 5 postcards for $1.75. Tanya buys 8 postcards for $2.80. Are the cost, y, in dollars and the number of postcards, x, proportional? Explain. Write an equation to represent this relationship.
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Home » Mathematics » Janet, Rose, and Tanya buy postcards from their favorite souvenir shop. Janet buys 3 postcards for &1.05. Rose buys 5 postcards for $1.75. Tanya buys 8 postcards for $2.80.