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Based on the graph you provided, we can determine the rate at which the water level in the bathtub increases by analyzing the slope of the line. 

### Step-by-Step Solution:

1. **Identify two points on the line:**
   From the graph, two clear points are:
   - (0, 0) — at time 0 minutes, the water level is 0 inches.
   - (4, 12) — at time 4 minutes, the water level is 12 inches.

2. **Calculate the slope (rate of increase):**
   The slope formula is:
   \[
   \text{Slope} = \frac{\text{Change in water level}}{\text{Change in time}} = \frac{12 - 0}{4 - 0} = \frac{12}{4} = 3
   \]

So, the water level increases by **3 inches per minute**.

Would you like a more detailed explanation or have any other questions?

### Related Questions
1. What is the slope-intercept form of the line representing this graph?
2. How would the graph look if the water filled at 5 inches per minute?
3. What is the total amount of water in the tub after 10 minutes at the same rate?
4. How do you determine the slope from a graph in general?
5. What does the y-intercept of this graph represent?

**Tip:** The slope of a line represents the rate of change. In real-life situations like this, it shows how quickly or slowly something happens over time.

How many inches does the water level in the bathtub increase by every 1 minute?

Learn how to determine the rate at which the water level in a bathtub increases by analyzing a graph. This step-by-step solution explains how to calculate the slope, which shows that the water level rises by 3 inches per minute. Perfect for students in Grades 6-8 learning about linear equations and slope.

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