Question

70 points.

Select the correct answer.
Which relation is a function?
(Look at the photo)

Option D didn’t fit in the photo, so here’s it typed out.

x | y
10 15
20 25
8 30
20 35

Answer 1

A is a function.

Explanation:

All the others are one-to-many relations.

For example in B, 3 maps to 10 and also maps to 30 ( one - to - many).

A function is a one-to-one or many-to-one mapping.

Answer 2

• Option A

Explanation:

Options B, C and D have repeat x-values with different y-values.

The relationship is many-to-one.

If graphed, those point appear on a vertical line.

Option A has one-to-one relation, so is the only functional relationship