Let's start learning by picking a lesson:

What does equal mean?

What is an unknown?

Understanding Simple Inequalities (Part 1)

Understanding Simple Inequalities (Part 2)

Understanding Simple Inequalities (Part 3)

More on Inequalities

Solving Equations

Equations with Two Variables

Solution Points

Straight Lines and Their Equations

Plotting A Straight Line

Solution of Linear Equations (demo of equation input and plotting, IE only)

Ploting of y=f(x) (demo of equation input and plotting, IE only)