The line, to fit the data, must pass through a majority of the given points and follow the path that the data is leading. The given line passes through only a few of the points and goes on a different path than the given data. So, it does not fit.
The height of glass 1 is 7.6 so, you find the volume of glass 2,= 26.376 then you subtract the answer from 80 cubic cm to get the volume of glass 1 80 - 26.376 = 53.694 then you work backwards to get the height, which is 7.6
