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The equation provided in the question is \( y = 60x + 250 \), where:

- \( y \) represents the amount of water in the pool after \( x \) hours.
- \( 60x \) suggests that the water is being filled at a constant rate.

In this context, the number **60** represents the rate at which the pool is being filled, measured in **gallons per hour**. Hence, the correct answer is:

- **the rate at which the pool is being filled**

Would you like more details on how to interpret linear equations in this context? 

Here are five related questions to consider:
1. What does the 250 represent in this equation?
2. How would the equation change if the filling rate was different, say 80 gallons per hour?
3. How can you calculate the total amount of water after 5 hours?
4. What would the equation look like if the pool initially had no water in it?
5. How does this equation relate to the concept of slope in linear functions?

**Tip:** In linear equations like this one, the coefficient of the variable (here 60) often represents the rate of change.

A pool is being filled at a constant rate. After x hours, the pool has y gallons of water. The amount of water in the pool can be modeled by the equation y = 60x + 250. What does the 60 represent in this equation?

Learn how to interpret the rate of change in a linear equation through this pool-filling problem. The equation y = 60x + 250 represents a pool being filled at 60 gallons per hour. Suitable for Grades 7-8.

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