re; product of slopes of perpendiculer lines;
Asked by | 16th Aug, 2009, 09:40: PM
if you read the theory behind the formula of perpendicular lines, it clearly says about two non vertical lines, hence it's not applicable to y axis.
also a line whose slope is not defined is called a vertical line.
Answered by | 16th Aug, 2009, 10:20: PM
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