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The line l1 ,l2 with slopes m1 , m2 are perpendicular if.

The line l1 ,l2 with slopes m1 , m2 are perpendicular if:

Incorrect

m1 + m2 = 0

Incorrect

m1 = m2

Incorrect

m1 - m2 = 1

Correct

m1 , m2 = -1

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