Extend the line joining a set of points on the Cartesian plane to show that there is an infinite number of ordered pairs that satisfy a given linear relationship

1. Ski-ing the Temperature Slopes - Time v. Temp : Estimate likely temp at 8:30am
2. Ski-ing the Temperature Slopes - Time v. Temp : Estimate temp at 7:30pm
3. Towing the line: Identify the next grid point on a line