[color=#000000]What can you conclude about perpendicular lines that are drawn in the coordinate plane? [br](Assume the lines are not aligned horizontally and vertically). [/color]
[color=#000000]Other than the case of horizontal and vertical lines, if two lines are drawn in the coordinate plane, then their slopes are always opposite reciprocals. Another way of expressing this fact is that their slopes always multiply to -1. [/color]