What is the slope of (-9, 6) and (4,-4)

Which term best describes the association between variables a and b? no association a negative linear association a positive linear association a nonlinear association a scatterplot with an x axis labeled, variable a from zero to ten in increments of two and the y axis labeled, variable b from zero to one hundred forty in increments of twenty with fifteen points in a positive trend.

For how answer my question this will be the last question can you answer in math subject

Adam used 1072.4 gallons of water over the course of 7 days. how much water did adam use, on average, each day?