The graph below shows the line of best fit for data collected on the depth, in feet, and velocity, in feet per second, at ten points along the columbia river. which of the following is the equation of the line of best fit? a. y = -6.67x + 13 b. y = -6.67x + 2.1 c. y = -0.15x + 1.95 d. y = -0.15x + 0.15