Move the sliders

*a*,*b*,*c*and*d*to explore the graphs of the linear functions*y*=*ax*+*b*and*y*=*cx*+*d*.- When are the graphs coinciding? intersecting? parallel?
- Describe the relationship between the appearance of the graphs and the parameters
*a*,*b*,*c*, and*d*. - Is it possible to adjust the sliders such that the two lines are perpendicular? Justify your answer.

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