The line passes (2,-1), (5,1), (8,3), (11,5). Find the equation of the line in point-slope form .

Please directly answer the question and provide the final value, e.g., 1, 2.5, 300.
Question: The line passes (2,-1), (5,1), (8,3), (11,5). Find the equation of the line in point-slope form .

Please first conduct reasoning, and then answer the question and provide the final value, e.g., 1, 2.5, 300, at the end.
Question: The line passes (2,-1), (5,1), (8,3), (11,5). Find the equation of the line in point-slope form .
