Mary has a piece of rope. She ties a knot in the rope and measures the new length of the rope. She then repeats this process several times. Some of the data collected are listed in the table below.

Given the linear regression equation y = -8.5x + 99.2 when the length, y, of the rope after tying a knots.
Explain what the y-intercept means in the context of the problem. Explain what the slope means in the
context of the problem.