the ratio between x and y

I express the amount of y kg of oil as a function of the quantity x kilograms of olives produced. Each kilo of olive oil produces 0.2 kilograms of oil. I form the value table (the covariance) between x and y. I notice that whenever the value of x is doubled, tripled, quadrupled, fivefold, and so on, the amount of oil produced doubles, tripling, quadruples, fivefold, respectively.

 

 

Prices for x	1	2	3	4	5
Prices for y	0,2	2.0,2	3.0,3	4.0,4	5.0,5

 

 

 The above table of values expresses the ratio  between x and y and is expressed algebraically by the function y = 0,2x