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Geo 2.8 Parallel and Perpendicular Slopes
Contributed by: DiLaura
Find the slope of each line. 
Write the slope as a fraction in lowest form (reduce if possible). 
slope of a = 
slope of b = 
Then tell if they are parallel, perpendicular, or neither. 
b
(-3, 3)
a
(1, 2)
(2, -2)
neither
a     b 
a // b
Find the slope of each line. 
Write the slopes as fractions (reduce
if possible). 
slope b = 
slope a =
Tell if these lines
are
parallel, 
perpendicular, 
or neither.
b
(-3, 1)
a
neither
perpendicular
parallel
(0,-3)
(1, 2)
(2, 0)
Tell whether the 
two lines are 
parallel 
perpendicular or 
neither by finding 
their slopes.
neither
perpendicular
parallel
b
a
(-3,-1)
(-3, 1)
(2, 0)
(3,-2)
Match the following graphs with an approximate slope value.  Use capital letters.
slope= -4
?
slope= 0
?
y
y
x
x
slope= undefined
?
slope = ¼
?
y
y
x
x
What is the slope of a line that is perpendicularto a line with a slope of -⅓
What is the slope of a line that is parallel 
to a line with a slope of ¾?
What is the slope of a line that is perpendicularto a line with a slope of ⅝
What is the slope of a line that is parallel 
to a line with a slope of ⅞?
Find the slope of the line CD if, 
C=(1, -4) and D=(3, 3)
Another line GH is perpendicular to this line. 
What is the slope of line GH?
slope = 
Find the slope of a line parallel to a line
with a slope of ⅜
slope = 
Find the slope of a line perpendicular to a 
line with slope m = - ⅜
slope = 
Find the slope of the line EF if, E=(0, 2) and D=(5, -3)simplify your result.
The line RT is perpendicular to line ED. 
What is the slope of line RT?
slope = 
slope of RT = 
Find the slope of the line AB if, A=(-2, -3) and D=(4, -3)simplify your result.
slope = 
Drag the label that describes the slope of the 
graphs below.
negative slope
?
Zero slope
?
positive slope
?
undefined
slope
?
Horizontal and vertical lines are 
____________________ perpendicular.
sometimes
 always 
never
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