Select the correct answer.
which relation is a function?
a.
x y
4 -2
5 -3
6 -2
7 -3
b.
x y
3 10
2 20
3 30
4 40
c.
x y
-5 2
-5 3
-10 4
-10 5
d.
x y
10 15
20 25
8 30
20 35
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introduction to functions: mastery test

The correct choice is A.

Step-by-step explanation:

The relation which is a function is the one in which none of the first coordinates repeated.

A.  

xy

4-2

5-3

6-2

7-3

We can see that none of the first coordinates repeated in this relation.

Its graph will pass the vertical line test.

It is a function.