Slopes and Angles (2)

Use the sliders (or input boxes) to change the slopes of lines j and k so they become perpendicular.
Same directions as above, yet this time create a pair of slopes that's different from the pair you discovered above.
Same directions as above, yet this time create a pair of slopes that's different from the pair you discovered above.
Check out the pairs of slopes you have in the apps above. List them below:
Notice anything interesting? If so, describe. What exactly causes the lines to be perpendicular?
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Information: Slopes and Angles (2)