Question

1. Which of the following relations is NOT considered a function?

(3,4). (4,5), (6,7), (8,9)
(-3,4), (4,-5). (0,0), (8,9)
(13,14), (13,5). (16,7). (18,13)
(3,90). (4,54). (6,71). (8,90)

Answer 1

The relation (13,14), (13,5). (16,7). (18,13) is not considered a function

Explanation:

Relations are only considered functions if each x value, which is the first number in each ordered pair or set of parentheses, has only one corresponding y-value, which is the second number in each ordered pair. The third option has two y-values, 14 and 5, for one x-value, 13. This means that it does not satisfy the requirements to be a function and therefore it is not a function.