please show all work I want the ax +bx+d

Hamsika wants to open a new Indian restaurant not more than 4- km from the center of her city. It should be strategically placed to avoid competition from existing Indian restaurants. The map at right shows the center of the city (the origin] and the existing Indian restaurants A to E. The grid units are in km. : 131253).. a. All but one edge of a Voronoi diagram has been drawn on the grid. 1. Find the midpoint of the line segment [BD]. [1] ii. Calculate the gradient of the line segment [BD]. [2] iii. Find the equation of the missing edge, giving your answer in the form ax+by+d=0,a,b,d GE. [3] Question 3 continues on the next page