I need help with these two problems please, and please answer all parts and make it legible.

Find the limit by rewriting the fraction first. y + 81 lim (x,y)-(9, -81) x y - xy +81x - 81x y# - 81, x*x y + 81 lim (Simplify your answer.) (x,y)-(9, -81) x y - xy + 81x - 81x y # - 81, x#xAt what point (x,y) in the plane are the functions below continuous? a. f(x,y) =sin (x+ y- 3) b. f(x,y) = In (x2 + y2 1) 3. Choose the correct answer for points where the function sin (x + y 3) is continuous. O A. for every (x,y) such that x + y - 3 > 0 O B. for every (x,y) such that x a 0 O C. for every (x,y) O D. for every (x,y) such that y 2 0