Question

For each relation decide whether or not it’s a function(This is ONE question I do on my math program with this is considered one question)

Answer 1

Relation 1:

It is a function because one point of its range (axis y) have two points in the domain (axis x).

Relation 2:

It is not a function because one point in the domain have two points in the range:

Relation 3:

It is a function because each point in the domain have a different point in the range.

Relation 4:

It is not a function because the point -7 in the domain have three values for the range:

The answer is, the relations: 2,4 are not functions and the functions 1, 3 are functions.