Question

. Solve the following pairs of equations:
(i) 5m – 5n = 12; 2m + 9n = 20

Answer 1

5m-5n=12.......(1)

2m+9n=20......(2)

from eq. (1)

5m-5n=12

5m=12+5n

m=12+5n/5........(3)

Now,

By putting the value of m in eq. (2)

2m+9n=20

2(12+5n/5)+9n=20

24+10n/5+9n=20

24+10n+45n/5=20

24+55n=100

55n=100-24

55n=76

n=76/55

now putting the value of n in eq. (3)

m= 12+5n/5

m= 12+76/55/5

m= 660+76/55/5

m=736/55×1/5

m= 736/275 Ans

HOPE IT HELPS YOU. ......

Answer 2

Answer:

I HOPE IT MIGTH BE HELP FOR U