The point P(9, 7) lies on the curve y = +4 7.1 7 6.9 8 8.5 9 9.5 10 a If Q is the point (, x+4), find the slope of the secant line PQ for the following values Enter at least 3 decimal places in your answers. If x = 9.1, the slope of PQ is: 3.9 If x=9.01, the slope of PQ is: If 8.9, the slope of PQ is: => If z = 8.99, the slope of PQ is: Based on the above results, guess the instantaneous rate of change of y = +4 at P(9.