That depends on what you have chosen for the axes. If one of the axes is enthalpy, then an adiabatic line would be a straight line perpendicular to that axis.
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Draw a vertical line if the line hits more than one point on the graph then it is not a function.
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The "vertical line test" will tell you if it is a function or not. The graph is not a function if it is possible to draw a vertical line through two points.
To work this out get some graph paper and draw the line.
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