3n+7m/3n-7m find the value
Answers
Answered by
0
Answer:
I think this type ans
Step-by-step explanation:
Let 7m+3n=12 ...(1)
and 3m+7n=8 ...(2)
From equation (2), find the value of m in terms of n
m=
3
8−7n
...(3)
Substituting m=
3
8−7n
in equation (1)
⇒ 7(
3
8−7n
)+3n=12
⇒
3
56
−
3
49n
+3n=12
⇒
3
−49n
+3n=12−
3
56
⇒
3
−40n
=
3
−20
⇒n=
−40
−20
⇒n=
2
1
Substituting n=
2
1
in equation (3), we get
m=
3
8−7(
2
1
)
⇒m=
3
2
9
⇒m=
6
9
⇒m=
2
3
Therefore, the value of m+n is
2
3
+
2
1
=
2
4
=2.
Similar questions