If xy represents a positive two digit number, where x and y are single digit integers, which of the following cannot be true?
Choose the correct choice from the following choices:
A) x+y =9  B) (x)(y)=9  C) x-y = 9  D) y-x= 9  E) x/y = 9
(A) xy = 45 or 63 or 27   (B) xy = 33 or 19   (C) 90   (D) impossible   (E) xy = 91   (D) is impossible because 09 is not a valid two digit number --- if there's a zero in the ten's place, that's just 9, a single digit number. Therefore, no valid two digit number would satisfy (D).   ans y-x= 9
<result>D</result>
If xy represents a positive two digit number, where x and y are single digit integers, which of the following cannot be true?