1.) The slope of PQ is (v – z) divided by ⭕️(w - x) or (x - w) or (z - v)

2.) The slope of P’Q' is
⭕️(v + b) - (z + b) or
(z + b) - (v + b) or
(v + b) + (z + b)

divided by (w + a) - (x + a).

3.) Both lines have a slope that is
⭕️(a - b) or (z + v) or (v - z)

3.5.) divided by
⭕️(a - b) or (w - x) or (x - w)

4.) Therefore, the lines are
⭕️parallel or perpendicular or intersecting.