We know that P1V1=P2V2 by Boyle's Law. Let's say this equation (i).
And we know that V1/T1=V2/T2 by Charle's Law. Let this equation be (ii).
Dividing (i)/(ii), we get P1T1=P2T2...
But it's completely wrong as Gay-Lussac's Law says P1/T1=P2/T2
So where am I wrong ???