To identify the y-intercept on a graph, look for the point where the line crosses the y-axis (the vertical axis). In this graph, the blue line intersects the y-axis at $y = 3$.

Thus, the correct answer to this question is:

3

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

Here are some related questions for further practice:

1. What is the x-intercept of the line in the graph?
2. How do you find the slope of a line from a graph?
3. What does the y-intercept represent in the context of a linear equation?
4. How would the line shift if the y-intercept were -2?
5. Can a line have both positive and negative y-intercepts?

Tip: The y-intercept is where the line crosses the y-axis, often giving insight into the starting value when x = 0.