Given an equation of a straight line, students calculate y coordinates corresponding to x values, and observe the plotting of the points for the (x, y) coordinate pairs which form the straight line.
(Variation of this applet to include students dragging "x" markers (and maybe even rulers) to "plot" the points are planned)
Update see worksheet at https://www.geogebra.org/material/show/id/gqsFaEDG
