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Byju's Answer
Standard XII
Mathematics
External Division
In what ratio...
Question
In what ratio does X-axis divide the line segment joining the points
(
3
,
4
)
and
(
2
,
6
)
?
A
2
:
3
internally
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B
2
:
3
externally
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C
3
:
2
internally
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D
3
:
2
externally
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Solution
The correct option is
B
2
:
3
externally
Given the points
(
3
,
4
)
and
(
2
,
6
)
let the required ratio be
K
:
1
⇒
By section formula
x
=
m
x
2
+
n
x
1
m
+
n
,
y
=
m
y
2
+
n
y
1
m
+
n
As x-axis divides (x,y) will be of the form (x,0)
x
=
2
K
+
3
K
+
1
,
y
=
6
K
+
4
K
+
1
⇒
6
K
+
4
K
+
1
=
0
⇒
6
K
=
−
4
∴
K
=
−
2
3
∴
2
:
3
externally
∴
putting the value of K in (x,Y)
x
=
2
K
+
3
K
+
1
=
2
x
−
−
2
3
+
3
−
2
3
+
1
=
−
4
+
9
3
−
2
+
3
3
=
5
y
=
6
K
+
4
K
+
1
=
6
×
−
2
3
+
3
−
2
3
+
1
=
−
12
+
9
3
−
2
+
3
3
=
−
3
∴
(
x
,
y
)
=
(
5
,
−
3
)
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Q.
The xy-plane divides the line joining the points (−1, 3, 4) and (2, −5, 6)
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(d) externally in the ratio 3 : 2
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