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Mathematics
Problem
If two non-vertical lines have slopes
m
1
m_1
m
1
and
m
2
m_2
m
2
, which condition must hold for the lines to be perpendicular? a)
m
1
m
2
=
1
m_1 m_2 = 1
m
1
m
2
=
1
b)
m
1
m
2
=
−
1
m_1 m_2 = -1
m
1
m
2
=
−
1
c)
m
1
+
m
2
=
0
m_1 + m_2 = 0
m
1
+
m
2
=
0
d)
m
1
m
2
=
0
m_1 m_2 = 0
m
1
m
2
=
0
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