we used 5 different concentration levels to test the absorbtion a potato slice had (to increase its weight) then we had to make a scatter plot chart and find the isotonic point.... the concentrations were 0, 0.1, 0.2, 0.4, 0.6 and 0.8...avg % changes in mass were (in order) 9.6, 7.2, 5, -3.99, -8.51 and -15.85...so once we made that chart apprently we should be able to find the point when it equals 0...i just am not sure how to find it...The question simply says find the isotonic point for sucrose absorption