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Byju's Answer
Standard XII
Mathematics
Pair of Lines
Find the coor...
Question
Find the coordinates of the point which divides the line segment joining
(
3
,
4
)
and
(
−
6
,
2
)
in the ratio
3
:
2
externally.
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Solution
If
P
(
x
,
y
)
lies on
¯
A
B
(but not in between
A
(
x
1
,
y
1
)
and
B
(
x
2
,
y
2
)
) such that
¯
A
P
:
¯
B
P
=
m
:
n
, then
P
is said to divide
¯
A
B
externally in
m
:
n
ratio.
P
(
x
,
y
)
=
(
m
x
2
−
n
x
1
m
−
n
,
m
y
2
−
n
y
1
m
−
n
)
Substituting
A
(
x
1
,
y
1
)
=
(
3
,
4
)
and
B
(
x
2
,
y
2
)
=
(
−
6
,
2
)
in the above equation will give
P
=
(
−
24
,
−
2
)
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Similar questions
Q.
Find the coordinates of the point which divides the line segment joining the points (1,-2,3) and (3,4,-5) in the ratio 2:3 (i) internally, and (ii) externally.
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