This is a video lesson about using equations to solve problems involving the constant of proportionality. I use this lesson as part of a grade 7 proportional relationships unit of study. This video covers how to use the equations y = kx and k=y/x to solve a variety of problems This video may be used as part of a flipped classroom or incorporated into your daily lessons. This video is aligned to standard 7.RP.A.2 Enjoy!