Scenarios for Linear Functions
Visual Patterns (visualpatterns.org)
Barbie Bungee (Matt Vaudrey, NCTM)
Sunset Times with varying Latitude (Michael Pershan via Park or Exeter I can't remember)
Spaced out Trees (Five Triangles)
Checkerboard Tiles (Dan Meyer)
Internet Cafe, Video Subscription, and Candle Burning (MAP)
Plant Height
D=RT
For zero slope: Constructing Scenarios when Given a Graph