Question

A hardware store sells nails by the pound. The graph below represents the price of nails at the store. What is the unit price of nails at the hardware store?

Answer 1

$2.5 per pound of nails

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We can see a point with whole coordinates on the graph. It is (4, 10).

Since it a proportional relationship, the unit price, the slope is the quotient of y and x coordinates:

• m = y/x = 10/4 = 2.5