To find $f(-3)$ from the graph of the piecewise function, let's analyze the graph at the point where $x = -3$.

From the graph:

1. At $x = -3$, the function's value corresponds to the filled blue dot at the point $(-3, -3)$.
2. The filled dot indicates that the function is defined at this point, and the value of the function is the $y$-coordinate of the point, which is $-3$.

Thus, $f(-3) = -3$.

Would you like a detailed explanation of how piecewise functions work or have any other questions?

Here are some follow-up questions:

1. What is a piecewise function, and how is it defined?
2. How can you tell if a function is defined at a specific point on a graph?
3. How do you handle open and closed points on a graph?
4. What are the key properties of continuous functions in piecewise graphs?
5. How do you evaluate a piecewise function from a given equation instead of a graph?

Tip: In piecewise functions, a filled dot means the function is defined at that point, while an open circle means it's not.