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Mathematics 36 Online
OpenStudy (anonymous):

Line A: y = 1 2 x + 2 Line B: y = -1 2 x + 7 Line C: y = -2x + 4 Line D: y = 1 2 x + 5 4 Which lines are perpendicular? A) A and B B) A and C C) B and C D) A and D

OpenStudy (shadowfiend):

Remember that two when two lines are perpendicular, the slope of one equals -1 / the slope of the other. Is that enough to help?

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