Answer:
Only 0,0 You don't order negative numbers of books which eliminates the first two pairs. And you don't order 1/2 a book which eliminates the last pair.
Explanation:
If you order 0 shirts they will weight 0 ounces is the only viable solution.
Y = total weight of books
X = number of books
6 = weight (in ounces) of 1 book
total weight of books = weight of books x number of books
Y = 6X
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