Find the slope of perpendicular lines
Perpendicular lines have slopes that are opposite reciprocals, like and . The slopes also have a product of 1.
Line t has a slope of . Line u is parallel to line t. What is the slope of line u?
Simplify your answer and write it as a proper fraction, improper fraction, or integer.
Line u is perpendicular to line t, so its slope is the opposite reciprocal. Find the opposite reciprocal.


Take the slope of line t 


Find the reciprocal 


Find the opposite 
Line s has a slope of . Line l is perpendicular to line s. What is the slope of line l?
Simplify your answer and write it as a proper fraction or as a whole or mixed number.