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Mathematics 16 Online
OpenStudy (anonymous):

Write an equation of a line that is parallel to y = 5. Write an equation of a line that is perpendicular to y = 5. What do you notice about the equation of the perpendicular line?

OpenStudy (noseboy908):

Alright, to begin, what do you know about parallel & perpendicular lines? How are their slopes related to a given slope?

OpenStudy (anonymous):

a perpendicular line has a slope that is a negative reciprocal of the parallel line

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