When lines are perpendicular, their slopes are negative reciprocals. A reciprocal is a fraction in which the numerator and the denominator are reversed.
The reciprocal of is . The reciprocal of –2 is , since –2 is . The negative reciprocal of is . The negative reciprocal of –2 is .
On the coordinate plane above, if Line 1 has a slope of , Line 2 has a slope of .
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