VIDEO #1 - Constant of Proportionality - Graphs
https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-ratio-proportion/modal/v/identifying-constant-of-proportionality-graphically
VIDEO #2 - What is proportionality?
https://www.youtube.com/watch?v=0Y0blHsu-wM
CORNELL NOTES w/Summary - PAGE 2
VIDEO #3 - Constant of Proportionality - Equations
https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-ratio-proportion/modal/v/constant-of-proportionality-from-equation
VIDEO #4 - Constant of Proportionality - Tables
https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-ratio-proportion/modal/v/proportionality-constant-from-table