Which is a factor of 5xy - 40x - 15y + 120?

A. 2

B. y - 8

C. x - 4

D. x + 6

Upon slight rearranging:

5xy-15y-40x+120, now factor 1st and 2nd pair of terms

5y (x-3) - 40 (x-3) which is equal to:

(5y-40) (x-3) if we factor the first parenthetical term as well

5 (y-8) (x-3)

So (y-8) is a factor