What is the slope of the line that passes through the points (1, -9)(1,−9) and (4, -7)(4,−7)? Write your answer in simplest form.

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.