\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
John is making a large batch of his special lemonade. The table below shows the number of cups of lemon juice (\(\textcolor{colordef}{x}\)) needed for a certain number of liters of lemonade (\(\textcolor{colorprop}{y}\)).
Cups of lemon juice (x) \(\textcolor{colordef}{2}\) \(\textcolor{colordef}{4}\) \(\textcolor{colordef}{6}\)
Liters of lemonade (y) \(\textcolor{colorprop}{3}\) \(\textcolor{colorprop}{6}\) \(\textcolor{colorprop}{9}\)
Calculate the coefficient of proportionality.