Question

Which of the given line represents a function?

• A. Line C
• B. Line A
• C. Line B
• D. Can't be determined

Answer 1

The correct option is B Line A

For the line A:

We can see that all the values of input (x) gives a single output (y). Hence it is a graph of a function.

For the line B:

We can see at x = 5, the value of y = 2, 4, 6 and 8.
Therefore, it is not a function

For the line C,
at x = -4, the value of y = 1 and 8.


Therefore it is not a function

∴ Only line A represents a function.