To write the equation for the total cost \( y \) in terms of the number of kites purchased \( x \), we need to consider both the cost of the kites and the shipping fee.
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The cost of the kites: Windy Kites sells each kite for $4. So, for \( x \) kites, the cost would be \( 4x \).
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The shipping cost: Windy Kites charges a flat rate of $16 for shipping, regardless of the number of kites purchased.
Putting this together, the total cost \( y \) can be expressed as:
\[ y = 4x + 16 \]
This equation represents the total cost in terms of the number of kites purchased \( x \).