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Byju's Answer
Standard IX
Mathematics
Solving Equations Using Method of Elimination
y ax and y =8...
Question
y a
x
and y = 8 when x = 4 then, find
(i) The value of y when x = 9
(ii) The value of x when y = 144
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Solution
y
α
x
∴
y
=
k
x
⇒
8
=
k
×
4
y
=
8
when
x
=
4
.
⇒
k
=
8
2
=
4
⇒
y
=
4
x
(
It
is
the
equation
of
variation
.
)
(
i
)
y
=
4
9
∵
x
=
9
⇒
y
=
12
(
ii
)
144
=
4
x
⇒
x
=
36
⇒
x
=
36
2
=
1296
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