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Byju's Answer
Standard XII
Mathematics
Implicit Differentiation
If x:y=8:9,...
Question
If
x
:
y
=
8
:
9
,
then find
(
7
x
−
4
y
)
:
(
3
x
+
2
y
)
.
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Solution
x
y
=
8
9
7
x
−
4
y
3
x
+
2
y
=
y
(
7
x
y
−
4
)
y
(
3
x
y
+
2
)
=
7
x
y
−
4
3
x
y
+
2
=
7
×
8
9
−
4
3
×
8
9
+
2
=
56
9
−
4
24
9
+
2
=
56
−
36
9
24
+
18
9
=
56
−
36
24
+
18
=
20
42
=
10
21
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0
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find
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Q.
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1. If
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,find the ratio
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and their l.c.m. is
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