a) Notice that Q is on the line x=-3, then the x-coordinate of Q is -3.
Since Q and P(x,y) are in the same horizontal line, then they must have the same y-coordinate, therefore:

b) Recall that the length of a segment is the distance between its terminal points, then:

c) Recall that a parabola is a curve where any point is at an equal distance from a fixed point (the focus) and a fixed straight line (the directrix), then:

d) Substituting FP and QP we get:

Therefore:

Answer:
(a) (-3,y)
(b)

(c)

(d)
