# Slopes and Angles (1)

- Author:
- Tim Brzezinski

- Topic:
- Algebra, Angles, Difference and Slope, Geometry, Straight Lines

## 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?
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(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?