Different sized containers are filled with oil. later, vinegar is added to make a salad dressing. the ratio used is 1 tablespoon of vinegar (y) to 0.5 tablespoons of oil (x). which of the following statements is true?

the function is y = 2x because the recipe calls for a ratio of 2 parts oil to 1 part vinegar.
the function is y = 2x because the recipe calls for a ratio of 2 parts vinegar to 1 part oil.
the function is y = 1/2x because the recipe calls for a ratio of 2 parts oil to 1 part vinegar.
the function is y = 1/2x because the recipe calls for a ratio of 2 parts vinegar to 1 part oil.