A thermodynamic cycle xyzx is shown on a V-T diagram

The P-V diagram that best describes this cycle is (diagrams are schematic and not to scale)

For the given V-T graph of thermodynamic cycle xyzx. In process $\mathrm{xy},\mathrm{V\alpha T}$ Pressure is constant

Process  is a isothermal compression process, so pressure increases in this process. Process  is a isochoric process in which temperature decreases. So pressure must decrease in this process. Hence, the p-V graph is as shown in the figure

$\begin{array}{l}\mathrm{x}\to \mathrm{y}\Rightarrow \text{ Isobaric }\\ \mathrm{y}\to \mathrm{z}\Rightarrow \text{ Isochoric }\\ \mathrm{z}\to \mathrm{x}\Rightarrow \text{ Isothermal }\end{array}$