3m-4n=7 ---------------(1)
5m+2n=16 -------------(2)
on multipling eq(2) by 2 we get:
10m + 4n =32 -----------------------(3)
On adding eq(1) and eq(3) we get:
13m = 39
or m=39/13
or m=3
putting the value of m in eq(2) we get:
5(3)+2n=16
or 15 + 2n =16
or 2n= 16 - 15
or n=1/2