Write each of the following in the form of \(ax + by + c = 0\) and indicate the values of \(a\), \(b\) and \(c\)  in each case.
 
(i) \(2x = -y + 2.5\)
 
(ii) \(4 = 5x - 3y\)
 
(iii) \(x = 5 - y\)