1. Click on points A and B to move them around.[br]2. You can use the slider to change the value of λ to show how the point with position vector [b]r[/b] = [b][color=#c51414]a[/color][/b] + λ[b][color=#0a971e]b[/color][/b] traces out a line[br]3. Use the checkbox to see the line traced out by P.