Example 3 - GRAPHICAL approach
GeoGebra
Graph from table
Like in Numerical approach, move the slider to fill the table with corresponding values. Afterwards select data in the spreadsheet and Create List of Points.
 
This is a Java Applet created using GeoGebra from www.geogebra.org - it looks like you don't have Java installed, please go to www.java.com

The  film of the steps how to use the applet. And here is the corresponding    file.
Other approaches