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Byju's Answer
Standard IX
Mathematics
Linear Equation in One Variable
1. Find out t...
Question
1. Find out the age of your grandfather and father. Form a linear equation among the two.
a) Age of your grandfather and your age
b) Your age and your father?s age.
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Solution
Dear
student
,
Let
the
age
of
mine
,
my
father
and
my
grandfather
be
25
,
50
,
and
75
years
respectively
.
(
a
)
Now
,
Age
of
mine
=
25
years
.
Age
of
my
grandfather
=
75
years
.
This
means
my
grandfather
is
thrice
times
older
then
me
.
∴
Grandfather
'
s
age
=
3
×
My
age
If
my
age
is
x
(
=
25
)
years
and
then
my
grandfather
'
s
age
will
be
3
x
years
.
∴
Required
linear
equation
is
Grandfather
'
s
age
=
3
x
(
b
)
Mine
age
=
25
years
.
My
Father
'
s
age
=
50
years
.
It
means
my
father
is
twice
of
mine
age
,
∴
Father
'
s
age
=
2
×
My
age
Father
'
s
age
=
2
x
This
is
the
Required
linear
equation
of
one
variables
.
Regards
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3
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