The graph below shows the numbers of cups of kiwi juice that are mixed with different numbers of cups of lemon-lime soda to make servings of kiwi soda:

a graph is shown. the values on the x axis are 0, 1, 2, 3, 4, 5. the values on the y axis are 0, 4, 8, 12, 16, 20. points are shown on ordered pairs 0, 0 and 1, 4 and 2, 8 and 3, 12 and 4, 16. these points are connected by a line. the label on the x axis is lemon-lime soda in cups. the title on the y axis is kiwi juice in cups.

what is the ratio of the number of cups of kiwi juice to the number of cups of lemon-lime soda