Question

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

Answer 1

It's A

Explanation:

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

A.

x y

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.

Answer 2

The correct choice is A.

Explanation:

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

A.

x y

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.