Education Technology

VIC: Advanced String Graphs Part 2

by Texas Instruments


  • Cartesian and parametric forms of lines and parabolas
  • Solutions to simultaneous equations
  • Generalisation of families of lines using parameters


  • Parameter
  • Simultaneous equations
  • Envelope

About the Lesson

This activity perfectly compliments Advanced String Graphs Part 1. The envelope created has the same form but a different equation, effectively rotated by 45 degrees. It is not essential that students complete Part 1 first, however the connection between these two activities builds towards Parts 3 and 4. Determining linear equations from two points, building a general introduces the notion of a parameter. Subsequent determination of successive points of intersection provides a set of parametric equations that can be explored. Check out the sequels: Part 3 and Part 4.