The expression xy+x is odd when the x and y are integers. Which of the following expressions must be even?  Choose one:
A) x
B) y
C) x + y
D) xy - x
E) x + y^2
xy+x is odd   x and y are integers   If x were even xy+x would be even despite any value of y.   y can't be odd, so y must be even.   Ans : y
<result>B</result>
The expression xy+x is odd when the x and y are integers. Which of the following expressions must be even?