The line below can be changed by dragging the blue points to a different location or by dragging the entire line. Points C and D can be moved along the line, but they cannot change the line.
- Move C and D along the line and calculate the ratio
m= ∆y/∆x=(y2- y1)/(x2- x1) for several different positions of the points.
- Show the equation of the line and look for a relationship between the coefficients of the equation and the slope and the y-intercept of the line.
Irina Boyadzhiev, Created with GeoGebra