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Mathematics
Mathematics
Problem
Prove that the line through
A
(
0
,
−
1
,
−
1
)
A(0, -1, -1)
A
(
0
,
−
1
,
−
1
)
and
B
(
4
,
5
,
1
)
B(4, 5, 1)
B
(
4
,
5
,
1
)
intersects the line through
C
(
3
,
9
,
4
)
C(3, 9, 4)
C
(
3
,
9
,
4
)
and
D
(
−
4
,
4
,
4
)
D(-4, 4, 4)
D
(
−
4
,
4
,
4
)
.
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