The expression that best represents the math problem is y = x + $1,400.
To identify the correct expression we must take into account the data provided by the statement:
Based on the above, we can infer that the correct expression is y = x + $1,400 because the cost of materials is independent and will not vary with the number of packages produced. On the other hand, the number of products equals the value of the packages.
For example:
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