Given an equation of a straight line, students calculate y coordinates corresponding to x values,
Example calculation for each case is provided if student makes an error.
Then they plot the points for the (x, y) coordinate pairs which form the straight line by dragging "x" markers to the correct positions on the graph.
Finally the line is automatically drawn joining the points using a virtual ruler.
Updated 20 May 2020
(Ruler fade away after line drawn, feedback with a "x" when user answer for y value is wrong.
Updated 7 Feb 2022
Bug fixed. Now points will appear for user to drag to correct positions, after correct values of y are entered.
If correct positions of points are achieved, the ruler appears and the equation of the line is drawn.
