Slopes and Angles (1)
Use the sliders (or input boxes) to make lines j and k parallel.
How can you tell the lines (in the previous app) are parallel? (Hint: The LARGE POINTS on each line are moveable.)
Use the sliders (or input boxes) to make lines j and k parallel. Make sure you get a pair of slopes different from the ones you created in the previous app.
Same directions as above, yet this time create a pair of parallel lines in a manner different from the two ways you did above.
Notice anything interesting? If so, describe. What exactly causes lines (graphed in the coordinate plane) to be parallel?