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Mathematics
Mathematics
Problem
In
△
A
B
C
\triangle ABC
△
A
B
C
, the vertices are
A
(
1
,
2
)
A(1,2)
A
(
1
,
2
)
,
B
(
5
,
4
)
B(5,4)
B
(
5
,
4
)
and
C
(
−
1
,
6
)
C(-1,6)
C
(
−
1
,
6
)
. Let
D
D
D
be the midpoint of
B
C
BC
B
C
. Find the equation of the line
A
D
AD
A
D
.
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