Help ASAP Ill mark brainliest

The equation respenting the left table is

Kayla made observations about the sellin price of a new brand of coffee that sold in the three different sized bags she recorded those observations in the following table 6 is $2.10 8 is $2.80 and 16 is to $5.60 use the relationship to predict the cost of a 20oz bag of coffee.

Iknow its nothing to do with education, but what type of thing should i wrote here? ? : ) its for mcdonald's btw.