Question

Which of the following graph is a function?. Identify using vertical line test.

• A. Fig: (iii)
• B. Fig: (i)
• C. Fig: (ii)

Answer 1

The correct option is B Fig: (i)

We know that if a vertical line intersect the graph at two or more than two point, then that graph is not a function.

Here, only Fig (i) is a function because a vertical line is cutting this graph only on one point and Fig (ii) and Fig (iii) are not functions because vertical lines are intersecting at two point.