Inverse variation can be represented as:
y
=
k
x
k
=
y
.
x
where
k
is the constant
x
=
7
and
y
=
10
so ,
k
=
7
×
10
=
70
Now, we have the value of
k
and
x
=
10
, substituting these in the variation to find
y
k
=
y
.
x
y
=
k
x
y
=
70
10
=
7
on observing the values
when
x
=
7
,
y
=
10
, and
when
x
=
10
,
y
=
3
as the value of
x
decreases
y
increases and vice verse as they vary inversely.
