Question

determine the graph that represents a function.

Explanation:

Use the vertical line test: a graph represents a function if no vertical line intersects it more than once.

1. Top graph (parabola): Any vertical line crosses it at most once.
2. Middle graph (ellipse): A vertical line can cross it twice.
3. Bottom graph (line): Any vertical line crosses it exactly once.

Answer:

[] The top parabola graph, [] The bottom linear graph