The point P(5, 1) lies on the curve y = . If Q is the point (x, 5 ), find the slope of the secant line PQ for the following values of x. If a = 5.1, the slope of PQ is: and if x = 5.01, the slope of PQ is: and if x = 4.9, the slope of PQ is: and if x = 4.99, the slope of PQ is: Based on the above results, guess the slope of the tangent line to the curve at P(5, 1)