A 3-pound bag of apples costs $5.25. What is the unit price of a pound of apples?
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25
The conversion of square feet to square yards can be represented by direct variation. Three square yards are equivalent to 27 square feet. Let y represent the number of square yards and x the number of square feet. Then y varies directly with x.
✔ y = (1/9)xy = (1/3)xy = 3xy = 9x
✔ f(n) = –3n + 23f(n) = –3n + 61f(n) = 20 – 3nf(n) = 20n – 3
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