Question

Which of the following graphed functions doesnt represent a function

Answer 1

The first graph.

Explanation:

To determine whether or not a line is a function or not, you can use something called the vertical line test. If it fails the vertical line test, then it is not a function.

Answer 2

The first graph doesn't represent a function.

Explanation:

When we need to deduct from a graph if it's a function or relation, we use the vertical line proof.

The vertical line proof consists in drawing a vertical line on the function.

• If the line intersect two points of the graph, then, the graph belongs to a relation.
• If the line intersect only one point of the graph, then, the graph belongs to a function.

Therefore, the first graph is not a function, because if we draw a vertical line, it will intersect two points of the graph.