According to the table, there is a linear relationship, because for every value of weight (lb) there is a value for Mass(kg) and when the Weight(lb) is incremented in 20, the Mass(kg) is incremented in 9
20/9 = 2.2222
40/18 = 1.2222
So there is a proportional relationship but it not 9, it is 2.2222
linear and proportional, the relationship is 9/20