Question

which of the following graphs represents a function?

Explanation:

A graph represents a function if it passes the Vertical Line Test: any vertical line drawn on the graph intersects it at most once.

1. Top-left graph: All vertical lines intersect at 1 point. Passes test.
2. Top-right graph: All vertical lines intersect at 1 point. Passes test.
3. Bottom-left circle: A vertical line can intersect at 2 points. Fails test.
4. Bottom-right graph: A vertical line can intersect at 2 points. Fails test.

Answer:

The top-left parabola graph and the top-right parabola graph represent functions.