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 
The slope of line u is 

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