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CDS Model Paper 2 Mathematics
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© examsnet.com
Question : 40
Total: 100
If
(
x
,
y
)
=
(
4
,
1
)
is the solution of the pair of linear equations
m
x
+
y
=
2
x
+
n
y
=
5
, then what is
m
+
n
equal to?
−
2
−
1
2
1
Validate
Solution:
Given,
(
x
,
y
)
=
(
4
,
1
)
and
m
x
+
y
=
2
x
+
n
y
=
5
∴
m
(
4
)
+
1
=
2
×
4
+
n
=
5
∴
4
m
+
1
=
5
and
8
+
n
=
5
⇒
m
=
1
and
n
=
−
3
∴
m
+
n
=
1
−
3
=
−
2
© examsnet.com
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