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Path dependence of Thermodynamic Variables

In NCERT TEXT BOOK it is written that
Since U is a state variable, ΔU depends only on the initial and final states and not on the path taken by the gas to go from one to the other. However, ΔQ and ΔW will, in general, depend on the path taken to go from the initial to final states. From the First Law of Thermodynamics,it is clear that the combination ΔQ – ΔW, is however, path independent.

ΔQ and ΔW will, in general, depend on the path taken ??andΔQ – ΔW, is however, path independent.
explain?? how??

Asked Krishan Billa

 

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