Thermodynamics: P-V diagram question

[physics_pi_rate]

Homework Statement

A monoatomic ideal gas undergoes a linear process whose equation is given by P/po+V/vo=1. find the volume when the process turns from an exothermic to an endothermic one. P-Pressure V-volume
Po= pressure when volume is nearly 0 and Vo is the volume when pressure is negligible.
i couldn't upload the P-V diagram hence I've given the suitable equation for the curve(straight line with intercept Po and Vo) and the relevant parameters.

Homework Equations

dU+ w=dQ.
U is a function of temperature only
w is the pressure-volume work of the gas [/B]

The Attempt at a Solution

i tried to maximize the temperature function but nothing was working

 

[anorlunda]

i tried to maximize the temperature function but nothing was working

Our rules do not allow the helpers to help unless you show your attempt. What you said is not enough.

 

[vela]

i tried to maximize the temperature function

Why? What does that have to do with the process being endothermic or exothermic?