Mapping
Diagram Sheets 
Mapping
Diagram blanks

Mapping
Diagram blanks

Work/Spreadsheets 
Spreadsheet
Template
(Linear Functions) 

Section from MD from A B to C and DE (Drafts) 
Visualizing Functions: An Overview 

GeoGebra 
Sketch to Visualize Solving a Linear Equation using Mapping Diagrams 

YouTube
Videos 
Using
Mapping Diagrams to Visualize Linear Functions (10 Minutes) 
Solving
Linear Equations Visualized with Mapping Diagrams. (10 Minutes) 