Question

Which mapping diagram represents a function from x → y?

Responses
A

Image without description
B

Image without description
C

Image without description
D

Image without description

Answer 1

I can’t see the diagrams you mean — could you either upload them or describe each one (which x’s point to which y’s)?

How to tell which is a function:
- A relation is a function from X to Y if every element of X has exactly one arrow to an element of Y.
- It’s still a function if two different x’s point to the same y.
- It is not a function if any x has no arrow or has arrows to two (or more) different y’s.

Using that rule, pick the diagram where every x has one and only one arrow. If you post the images or a short description (e.g. “A: x1→y2, x2→y1 and x3→y1”), I’ll pick the correct letter.