The task in the image asks to determine whether each graph represents a function. To assess this, we can apply the vertical line test: a graph represents a function if and only if no vertical line can intersect the graph at more than one point at a time.

Let's analyze each graph:

1. Gráfico 1: The vertical line test shows multiple points on a single vertical line (for example, around $x = 1$). Therefore, this is not a function.

2. Gráfico 2: Any vertical line drawn will intersect the graph at only one point. Hence, this is a function.

3. Gráfico 3: A vertical line can intersect the graph in multiple places (for instance, near $x = 0$). This is not a function.

4. Gráfico 4: Several vertical lines intersect more than one point (for example, $x = -1$). This is not a function.

5. Gráfico 5: Every vertical line intersects the graph at most once. Hence, this is a function.

6. Gráfico 6: A vertical line intersects the graph at multiple points (such as near $x = 1$). Therefore, this is not a function.

If you would like more details or have further questions, let me know!

Here are 5 related questions to explore the topic further:

1. What are the key characteristics of a function in terms of domain and range?
2. How does the vertical line test relate to the definition of a function?
3. Can a horizontal line test be applied to check if a graph is a one-to-one function?
4. How do transformations (shifting, reflecting) affect whether a graph represents a function?
5. What are some real-world examples where we need to determine if a relation is a function?

Tip: Always apply the vertical line test to quickly verify if a graph represents a function!