In an experiment with rabbits, the amount of food administered was varied, and in addition 1 g of cholesterol was added to the diet daily for several weeks. The amount of food X is increased as daily grams per kg of weight at the beginning of the experiment, and the cholesterol Y at the end of the experiment in mg. The data is presented below:

Food ammount, g X	cholesterol, mg Y		Food ammount, g X	cholesterol, mg Y
10	313		33	677
15	370		35	151
18	424		36	280
19	356		37	245
20	310		39	396
21	349		42	278
21	365		45	297
24	245		54	224
25	373		56	346
27	395		56	141
28	156		59	139
30	243		59	424
30	150		60	316
31	463		64	379