The graph below shows a line of best fit for data collected on the number of dogs visiting a dog park since it first opened. the equation for the line of best fit is y = 0.39x + 15.89. which of the following statements is true for the above graph? a. the y-intercept of the line is 0.39, meaning that about 4 dogs visited the park on the day it opened. b. the slope of the line is 0.39, meaning that on the day the dog park opened, there were about 4 dogs visiting the park. c. the slope of the line is 15.89, meaning that on average, every day since the dog park opened, about 16 more dogs visit the park. d. the y-intercept of the line is 15.89, meaning that on the day the dog park opened, there were about 16 dogs visiting the park.