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9 April, 04:30

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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  1. 9 April, 04:36
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    Step-by-step explanation:

    Janet, Rose, and Tanya buy different number postcards from their favorite souvenir shop

    Janet buys 3 postcards for $1.05.

    This means Janet bought one postcard at the rate of 1.05/3 = 0.35 per postcard.

    Rose buys 5 postcards for $1.75.

    This means Rose bought one postcard at the rate of 1.75/5 = $0.35 per postcard.

    Tanya buys 8 postcards for $2.80.

    This means Tanya bought one postcard at the rate of 1.75/5 = $0.35 per postcard.

    The unit rate at which Janet, Rose and Tanya bought = $0.35

    This means the cost, y, in dollars and the number of postcards, x is proportional.

    The equation representing the relationship is

    x = 0.35y
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