Question

Which of the following is/are a function?

• A.
• B.
• C.
• D.

Answer 1

Answer: (B), (C)

The correct options are
B
C

By vertical line test.


Vertical line cuts the curve infinite times, so it is not a function.

Vertical line cuts the curve only one time, so it is a function.

Vertical line cuts the curve only one time, so it is a function.


Vertical line cuts the curve two times, so it is not a function.