Question

7 Зm - 4n = -14
2m + 2n = 14​

Answer 1

Step-by-step explanation:

7 3m - 4n = -14 ×2

2m + 2n = 14 ×4

According to the formula

146m - 8n = - 28

8m +8n = 56

- - -

Less

138m = - 84

m = - 84/138

= - 48/69

Put the value of (m) in any equation

8(-48/69) + 8n = 56

8n = 56 + 384/69

n = 56 + 128/23

n = 1188 +128 /23

n = 1316 / 23

Answer 2

73m-4n= -14-----1

2m+2n= 14------2

Step by step explanation

from----2

2m=14-2n

m=14-2n/2

substitute for-----1

73(14-2n/2)-4n=-14

36.5(14-2n)-4n

511-73n-4n

511-77n=-14

-77n=-14-511

n=-497/-77

n=6.4545454545454-------3

sub 3 on 2

2m+2(6.4545454545454)=14

2m+ 12.909090909090=14

2m=14- 12.909090909090

m= 1.0909090909090/2

m= 0.5454545454545

Answer is

m= 0.5454545454545

n=6.4545454545454

Proof

73(0.5454545454545)−4(6.4545454545454)

=-13.99999999999

2(0.5454545454545)+2(6.4545454545454)

=13.999999999999