Is x0 ? 1) xy+y=y 2) xy+x=x

Question

Is x>0 ?
1) xy+y=y
2) xy+x=x

yezz · Answer

from one

y(x+1) = y

either y = zero

or x = -1..........insuff

from 2

x(y+1) = x

either x = zero

or y = -1.............insuff

both together

E

WinIT · Answer

Can we not consider (x+1)=y/y ; so x=-1 ?

yezz · Answer

xy+y=y

y(x+1) = y

what if y = 0 , we cant devide 0/0 can we??

thats why unless it is mentioned or implied that y is not = 0 we cant follow your way.

spriya · Answer

IMO E
1) xy=0 does not suffice since x can be any sign with y=0 or x=0
2) same as 1

together no new info is provided 
INSUFFI

Is x>0 ? 1) xy+y=y 2) xy+x=x