22 P is the point (1, –3) and Q is the point (7, 2). (a) Find the coordinates of the midpoint of PQ. (b) Find the gradient of the line PQ. (c) The line, L, with equation 2x – 5y = k, passes through the point Q. (i) Find the value of k. (ii) The line x + Ay = 3 is parallel to L. Find the value of A.