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1
Section 2.5 – Parallel and Perpendicular Lines:
Two lines with slopes
m
1
and
m
2
are parallel
if and only if
m
1
=
m
2
.
Two lines with slopes
m
1
and
m
2
are perpendicular
if and only if
m
1
m
2
= 1.
m
1
=2
m
2
= 2
m
1
= 2
m
2
= 1/2
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If you have a line with slope
5;
Any line that is parallel to this line has slope: ________.
Any line that is perpendicular to this line has slope: ________.
If you have a line with slope
6;
Any line that is parallel to this line has slope: ________.
Any line that is perpendicular to this line has slope: ________.
If you have a line with slope
2/5;
Any line that is parallel to this line has slope: ________.
Any line that is perpendicular to this line has slope: ________.
1. State whether the following lines are parallel, perpendicular, neither or the same.
1
4

=
x
y
2
4
+
=
x
y
2. State whether the following lines are parallel, perpendicular, neither, or the same.
2
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 Spring '08
 Staff
 Slope

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