If (1+y)x=xwhich of the following must be true? Pick:
A) x=-1 or y=0
B) x=0 or y=-1
C) x=1 or y=1
D) x=-1 or y=-1
E) y=0 or x=0
We have (1+y)x=x   If x=0, y=y. True   If y=0, (1+x)*0=0 True   So, y=0 or x=0 will be the answer.
<result>E</result>
If (1+y)x=xwhich of the following must be true?