# How do you find the domain and range of the relation and determine whether the is a function: ((5,90), (4,70), (5,30), (7,50)?

##### 1 Answer

Dec 13, 2017

Domain {5,4,7} Range {90,79,30,50}

#### Explanation:

The domain is the x number. In a coordinate set, the domain would be x which is the first number. If there is a number that's there twice or more you only have to write it once. The range is the y number. In a coordinate set, the range would be y which is the second number. Same thing with domain, you only have to write it once of it repeats.

A function can only have one x value for one y value. This wouldn't be a function because 5 repeats and the y value, for two of them, would have the same x value so it wouldn't be a function.