CHEMISTRY
posted by Anonymous .
When we combine the three gas laws into one expression:
V is directly proprtional to T
P is directly propetional to T > PV is directly proprtional to T
P is inversely proportional to 1/V
PV/T= constant
*******I do not understand how PV is directly proportional to T and how PV/T= constant. Is there a mathematical manipulation or something? Please explain.

PV=nRT replacing nR with c,a constant, then PV=cT
so PV is directly proportional to T
for part 1, divide
PV=cT by T
PV/T=constant