Question

solve mx-ny=m^2+n^2 and x+y=2m

Answer 1

mx-ny=m^2+n^2.........1
x+y=2m
Multiply n on bs
nx+ny=2mn.......2
Add 1&2
mx+nx=m^2+n^2+2mn
x(m+n)=(m+n)^2
x=(m+n)
Put x=m+n in x+y=2m
m+n+y=2m
y=(m-n)