plot the P on the y-axis and the V on the x-axis.

for the first point, you have P = 100, and V = 0.165, thus you have the relationship:b)supposing a straight line on the graph passes through the first and last data points, find the values of C and n in this example. there is no need to plot an accurate graph here.

for the last point, you have P = 500 and V = 0.055, thus you have the relationship:

thus you need to solve the system:

.........................(1)

..........................(2)

for and

incidentally, this is probably how I'd deduce that the relationship works in part (1), solve for C and n between each pair of points, but that may be too tedious. you may be able to tell what, say n is by the shape of the graph. if it is like a parabola, you know n = 2, for example