Final answer:
The independent variable is the number of necklaces ordered (n), and the dependent variable is the total cost of ordering the necklaces (y).
Step-by-step explanation:
The independent variable in this scenario is the number of necklaces ordered, which is represented by the variable n. The dependent variable is the total cost of ordering the necklaces. To determine the total cost, we multiply the number of necklaces (n) by the cost per necklace ($7) and add the fixed shipping cost ($6). Therefore, the equation that represents the total cost (y) in terms of the number of necklaces (n) is:
y = 7n + 6