Find the values of p in (i) to (iv) and p and q in (v) for the following pair of equations
(i) `3x - y - 5 = 0` and `6x - 2y - p = 0 `, if the lines represented by these equations are parallel.
(ii) `-x + py = 1 ` and ` px - y = 1`, if the pair of equations has no solution.
(iii) `-3x + 5y = 7` and ` 2px - 3y = 1`,
if the lines represented by these equations are intersecting at a unique point.
(iv) `2x + 3y - 5 = 0` and ` px - 6y - 8 = 0`,
if the pair of equations has a unique solution.
(v) `2x + 3y = 7 ` and `2px + py = 28 - qy`,
if the pair of equations has infinitely many solutions.