9. Suppose that X and Y are (discrete) random variables with ?X > 0 and ?Y > 0 and that a1 > 0, b1, a2 > 0, b2 are constants. Show that ?(a1X + b1, a2Y + b2) = ?(X, Y ).10. Suppose that 0 < p < 1 4 and that X and Y have joint pmf as shown: column -1,0, 1 row -1,0, 1Show that this is an example for which X and Y have zero correlation but are not independent.