Apps Khan Academy Cengage M MyOpenMath - MA... M MyOpenMath - SC. > > Readir The point P (1, 7) lies on the function of f(x) = 8x - x2. If Q is the point (x, 8x - x2) , graph the function f(a) and the secant lines PQ passing through P (1, 7) for each value of a below. Also find the slope for each value. Only a simplified fraction will be accepted. If a = 2 , the slope of PQ is: If a = 1.5 , the slope of PQ is: If a = 0.5 , the slope of PQ is: Graph 20