Question

remember answer is x=m+ n ,y=m-n ​

Answer 1

Answer:

x=2m-y

m(2m-y)-ny=m^2+n^2

2m^2-my-ny=m2+n2

m2-n2=my+ny

(m+n)(m-n)=(m+n)y

so ...we find that y=m-n...