This time, you are looking at Boyle's law. You are right, V is not proportional to P (this graph is not even a straight line), but V is proportional to 1/P.
A plot of V (y-axis) vs. 1/P (x-axis) will be a straight line with a positive slope. Did you use the reciprocals of the pressure values, 1/P? You do not want to use P = 0 because 1/P would be undefined. Since the instructions want you to give the units of the slope, what are the units of 1/P? Then, what are the units of the slope?
It is also best to get the slope from the complete graph, not just from two points. But if those two points lie exactly on the best fit straight line through all the points, that would be OK.
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