Question

Which things are functions and which aren't

Answer 1

Answer: the curved one is not a function because it is curved.

Explanation:

Answer 2

Vertical lines are not functions.(not functions )

Function with no arguments and no return value.

Function with no arguments and a return value.

Function with arguments and no return value.

Function with arguments and a return value.

Explanation:

The equations y = ± x and x 2 + y 2 = 9 are examples of non-functions because there is at least one -value with two or more -values. The vertical line test is a great way to visualize a violation of the definition of a function.