17. A straight fime passes through the points (8, -2) and (4, -4). (a) Write its equation in the form ax +by+c=0 where a, b and c are integers. (b) If the line in (a) above cuts the x-axis at point P, determine the coordinates of P. (c) Another line which is perpendicular to the line in (a) above passes through point P and cuts the y-axis at the point Q. Determine the coordinates of point Q. (d) Find the length of QP​