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Mathematics 16 Online
OpenStudy (anonymous):

what does it mean when there are perpendicular lines in graphs ?

OpenStudy (saifoo.khan):

When the lines are perpendicular, that means that they have the same slope.

OpenStudy (anonymous):

So it's like do they have same gradient or ?

OpenStudy (anonymous):

90 degrees to each other http://en.wikipedia.org/wiki/Perpendicular

OpenStudy (anonymous):

noo when lines are perpendicular the product of their gardients gives -1

OpenStudy (anonymous):

It means x= it

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