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How do you find the equation of line of best fit? urgent

Amuffin recipe, which yields 12 muffins, calls for cup of milk for every 1 cups of flour. the same recipe calls for cup of coconut for every cup of chopped apple. to yield a batch of 30 muffins, how much flour will be needed in the mix?

Can someone me i’m confused. will give brainliest and a whole bunch of points