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 Discussion: Traffic Jam Applet tool Topic: perpendicular lines Related Item: http://mathforum.org/mathtools/tool/10/

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 Subject: Try looking at the graph Author: Sharon Schering Date: Dec 11 2003
The formal way is to multiply the slopes to get -1 for lines that are
perpendicular.

You might try the informal way of graphing the lines and looking at them.  Put
"Graphit" in the Math Tools box in the upper left, and hit search.

Put in the lines to be graphed one at a time to tell what color is which.  You
will need to put a * for multiplication between the 5 and the x. Also you will
need to put a comma between equations With two equations it will read:
(1/5)*x-2,5*x-(1/2).

It will probably come up so I'll tell you that parallel lines have the same
slope.

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