Question

A store sells notebooks for $3 each and does not charge sales tax. If x represents the number of notebooks Adele buys and y represents the total cost of the notebooks she buys, which best describes the values of x and y?

The value of x can be any real number, and y will be a real number.
The value of x can be any real number greater than or equal to 0, and y will be a real number greater than or equal to 0.
The value of x can be any integer, and y will be an integer.
The value of x can be any integer greater than or equal to 0, and y will be an integer greater than or equal to 0.

Answer 1

Answer:The value of x can be any integer greater than or equal to 0 and y will be any integer greater than or equal to 0

Step-by-step explanation: By the question y=3x

A notebook is always a whole number so it is any integer greater than or equal to 0

As y=3x y is also greater than or equal to 0

Answer 2

Given: A store sells notebooks for $3 each and does not charge sales tax. If x represents the number of notebooks Adele buys and y represents the total cost of the notebooks she buys.

To find: Which best describes the values of x and y?  

The value of x can be any real number, and y will be a real number.

The value of x can be any real number greater than or equal to 0, and y will be a real number greater than or equal to 0.

The value of x can be any integer, and y will be an integer.

The value of x can be any integer greater than or equal to 0, and y will be an integer greater than or equal to 0.

Solution: "The value of x can be any integer, and y will be an integer" best describes the values of x and y.

According to the question, a store sells notebooks for $3 each. Thus, the price of each notebook is an integer. Now, it is given that the number of notebooks Adele buys is x. The value of x also needs to be an integer because the number of notebooks she buys must be a whole number. A whole number would from a positive integer.

Since y is the total cost of all the notebooks gotten by Adele, the value of y would be

$y = 3x$

The product of two whole numbers must be a whole number. Thus, y is a positive integer as well. Now, the value of x and y cannot be zero since Adele buys books and pays for them.

Therefore, "The value of x can be any integer, and y will be an integer" best describes the values of x and y.