This is applet is for investigating parallel and perpendicular lines.

Parallel and Perpendicular Line Investigation
1. Look at the three lines and their equations color coded red, green and blue.
Find the following:
Red Line m = ________ b = _________
Blue Line m = ________ b = _________
Green Line m = ________ b = ________
2. Move Point B to (1, 4) and find the following:
Red Line m = ________ b = _________
Blue Line m = ________ b = _________
Green Line m = ________ b = ________
3. Move Point B to (3, 1) and find the following:
Red Line m = ________ b = _________
Blue Line m = ________ b = _________
Green Line m = ________ b = ________
4. What do you notice about the slopes (m) of the lines?
Slopes of parallel lines are ________________.
Slopes of perpendicular lines are _______________ and ________________.
5. Move Point B to the origin (0, 0) and write the equations for the:
Red Line
Blue Line
Green Line
6. What conclusions can you make based on the equations from part 5?