? At the end it’s a 1 btw

Plot the points (0,6), (3,15.8), and (9.5,0) using the graphing tool, and find the function

11. minitab software was used to find the lsrl for a study between x=age and y=days after arthroscopic shoulder surgery until an athlete could return to their sport. use the output to determine the prediction model and correlation between these two variables. predictor coef se coef t p constant -5.054 4.355 -1.16 0.279 age 0.2715 0.1427 1.9 0.094 r-sq = 31.16%

I’m stuck on this equation, anyone got the answer?