To write an equation for the total cost \( y \) in terms of the number of kites purchased \( x \) from your competitor, Windy Kites, we need to consider both the cost per kite and the flat shipping fee.
- The cost per kite is $4, so the cost for \( x \) kites is \( 4x \).
- The flat shipping fee is $16.
Putting these two components together, the total cost \( y \) can be expressed as:
\[ y = 4x + 16 \]
So, the equation for the total cost in terms of the number of kites purchased is \( y = 4x + 16 \).