Question

Solve by substitution method :-
(i) 3m = 2n- 6 1/2 ,4m+n= 6
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Answer 1

m - n = 7 (1)

3m + 2n = 6 (2)

solve for m from (1)

m=7+n (3)

now substitute (3) into (2) for m

3(7+n)+2n=6

21+3n+2n=6

21+5n=6

5n=6-21

n=-15/4

n=-3

no plug n=-3 into (1)

m - (-3) = 7

m=4

4m+ 6(5)= 54

4m+30=54

=4m= 54-30=14

=m=14÷4=7/2

Answer 2

Answer:

m=0.5,n=4

Step-by-step explanation:

3m=2n-13/2. (1)

n= 6-4m. (2)

Put value of n in equation 1

3m=2(6-4m)-6.5

3m=12-8m-6.5

3m+8m = 5.5

11m=5.5

m=0.5

Put value of m in equation 2

n=6-2=4