I need help with 9c, the answers say it's (-1, 9), I keep getting (-1, 23).

9. The point (1, 8) is on the graph ofy = f (x) Find the corresponding coordinates of this point on each of the following graphs. a) y = 3f(x - 2) d) y = "f(4(x + 1)) b) y =f(2(x + 1 4 e) y = f(x) c) y = 2f(x) 7 f) y = 0.5f(0.5(x + 3)) + 3