In Problems 1-2, use a graphing utility to graph the functions.

1. Given f(x) = e-x. Graph y = f (x) and y = f (kx) = e-kx for each k, where k = 0.1, 0.5, 2, and 5. Explain the effect that different values of k have on the graphs.

2. Given f(x) = 2-x. Graph y = f (x) and y = mf (x) = m(2-x) for each m, where m = - 7, - 2, 3, and 8. Explain the effect that different values of m have on the graphs.