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OpenStudy (anonymous):
explain how can you determine if the graphs of two lines are parallel or perpendicular without graphing the lines
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OpenStudy (rulnick):
parallel: same slope
OpenStudy (rulnick):
perp: one slope is negative reciprocal of the other (m, -1/m)
OpenStudy (rulnick):
...but often forgotten: can also have one of slope 0 and one of undefined slope (for example, y=3 and x=2)
OpenStudy (anonymous):
deja vu, that certain feeling you get when you think you've been there before
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OpenStudy (rulnick):
:)
OpenStudy (anonymous):
thank you so much(:
OpenStudy (rulnick):
welcome.
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