solve the differential equation dy+dx=x+y+1+x+y-1
dx+dy=d(x+y)
d(x+y)=2(x+y)
Let x+y=z
dz/z=2
Now integrating on both sides
ln(z)=2z+c
ln(x+y)=2(x+y)+c
dx+dy=d(x+y)
d(x+y)=2(x+y)
Let x+y=z
dz/z=2
Now integrating on both sides
ln(z)=2z+c
ln(x+y)=2(x+y)+c