If two lines are perpendicular, which statement must be true?

A. The product of their slopes is -1.
B. Their slopes are equal.
C. The product of their slopes is 1.
D. Their slopes are opposites.

Question

If two lines are perpendicular, which statement must be true?

 		A.	The product of their slopes is -1.
 		B.	Their slopes are equal.
 		C.	The product of their slopes is 1.
 		D.	Their slopes are opposites.

sweetburger · Answer

for example say a line has a slope of 2 what would the line perpendicular to this lines slope be?

sweetburger · Answer

it would be -1/2 so you could say since the  that the product of the slopes is 2(-1/2) = -1

campbell_st · Answer

why is the slope -1/2...?

anonymous · Answer

so it would be D the slopes would be opposite

sweetburger · Answer

tallan it is not -2

freckles · Answer

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find the slopes of both of these lines