Where to get the graphing widget used in Algebra 1

In Algebra 1, Unit 4, Lesson 2, "Graphing a line given point and slope", Sal mentions the graphing widget is available on Khan Academy. I can't find it anywhere and have searched for quite a while. Does anyone know where I can find it or a suitable alternative that will allow me to place the points on the graph myself instead of inputting an equation? (or have both capabilities).