Question

Which graph represents a function whose inverse is also a function?

Answer 1

Hello,

the only bijection is D
Others f^-1(x) have 2 images.

Answer D.

Answer 2

Answer:

The correct option is 4.

Step-by-step explanation:

If a graph passes vertical line test then the graph represents a function.

If graph of a function passes horizontal line test then inverse is also a function.

Vertical line test : There are no vertical lines, intersect the graph at more than one point.

Horizontal line test : There are no horizontal lines that intersect the graph at more than one point.

From the below graph it is clear that graph 1, 2 and 3 do not pass horizontal line test.

Only graph 4 passes the horizontal line test.

Therefore the correct option is 4.