Find the limit of the following function as (x,y) → (0,0) along the paths y = kz and y = kr². Can you conclude that the limit does or does not exist in general? f(x, y) = 2ry 24 + y² Question 5 Determine the equation of the plane that contains point P(2, 3, -1) and is perpendicular (orthogonal) to normal vector n = (2, 1, 2). Give your answer in the form of a linear equation, where z = 20 + ax + by.