(b) In case of given graph, $V$ and $T$ are related as $V = aT - b,$ where $a$ and $b$ are constants.
From ideal gas equation, $PV = \mu RT$
We find $P = \frac{\mu RT}{aT - b} = \frac{\mu R}{a - b/T}$
Sinec $T_{2} > T_{1},$ therefore $P_{2} < P_{1}$