Peaches are being sold for 2 dollars per pound. The customer created a model to represent the total cost of peaches bought. If x represents the number of pounds of peaches bought and y represents the total cost of the peaches, which best describes the values of x and y ?
Answer
A
The value of x and y will always be zero.
B
The values of both x and y can be any real number.
C
The value of x can be any real number greater than or equal to 0 , but the value of y must be an integer greater than or equal to 0 .
D
The values of both x and y will be real numbers greater than or equal to 0 .
Explanation
The relationship is y = 2x, since each pound costs $2. A customer can buy a fractional number of pounds, so x can be any nonnegative real number; the resulting cost y can also be any nonnegative real number. Therefore, the best description is that both x and y are real numbers greater than or equal to 0.
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