Question

What are the two ways to determine if something is a function

Answer 1

If a vertical line crosses the relation on the graph only once in all locations, the relation is a function.

However, if a vertical line crosses the relation more than once, the relation is not a function.

Explanation:

Using the vertical line test, all lines except for vertical lines are functions.

Answer 2

If a vertical line crosses the relation on the graph only once in all locations, the relation is a function. However, if a vertical line crosses the relation more than once, the relation is not a function. Using the vertical line test, all lines except for vertical lines are functions.

Explanation: