Answer:
The relationship between the number of smoothies purchased (x) and the remaining money (y) can be described using the equation:
![\[ y = 105 - 3.50x \]](https://img.qammunity.org/2024/formulas/mathematics/college/hjbrgx5bk9yoj5sf694ui956vzxxxyu4zk.png)
Here, $105 is the initial amount on the gift card, and $3.50 is the cost of each smoothie. The equation subtracts the cost of each smoothie (3.50x) from the initial amount to calculate the remaining balance (y) on the gift card after purchasing x smoothies.
Explanation: