Checking If Relations are Functions

Checking If Relations Are Functions

Introduction

Mapping diagrams show how inputs are paired with outputs. They provide a simple way to determine whether a relation is a function by examining the arrows from each input. By checking these connections, we can quickly id...

Look at the two mapping diagrams connecting inputs and outputs.

Let's determine which relation represents a function.

In the first mapping diagram, each input is connected to exactly one output.

For example, input −9 is paired with 3, input −2 is paired with 5, and both inputs 5 and 8 are paired with 7. Since every input has o...