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Byju's Answer
Standard VIII
Mathematics
Algebraic Identities
If 81 y =9/39...
Question
If
81
y
=
9
3
y
, find y.
A
y
=
1
2
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B
y
=
1
5
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C
y
=
2
5
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D
y
=
5
2
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Solution
The correct option is
C
y
=
2
5
81
y
=
9
3
y
(
3
4
)
y
=
3
2
3
y
=
3
2
−
y
3
4
y
=
3
2
−
y
Equating the powers, we get
4y=2-y
5y=2
y
=
2
5
Suggest Corrections
2
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