If a + xy = a and x is not equal to 0, which of the following must be true?	Pick:
A) y=0
B) x>y
C) y<x
D) x-y=0
E) x+y=0
a + xy = a --&gt; xy=0. Since x is not equal to 0, thus y = 0.   y=0nswer: y=0
<result>A</result>
If a + xy = a and x is not equal to 0, which of the following must be true?