Mathematics, 11.10.2019 20:00, demarley3093

You can buy 3 post cards for $5.40 , 6 post cards for $10.80 or 9 postcards for $16.20.what is the constant of proportionality for buying post cards?

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You can buy 3 post cards for $5.40 , 6 post cards for $10.80 or 9 postcards for $16.20.what is the c...