Straight Line - Equations - Properties

Move the sliders a, b, c and d to change the position of the straight lines. Answer all the questions in a separate sheet of paper.
1.When are the graphs coinciding? intersecting? parallel? 2.Which parameter represents the slope of BLUE line? 3.which parameter represents the y-intercept of GREEN line? 4.Describe the relationship between the appearance of the graphs and the parameters a, b, c, and d. 5.Is it possible to adjust the sliders such that the two lines are perpendicular? Justify your answer. 6.What is the equation of the BLUE line?