yt = all + a13't1 + 3: For simplicity, let's assume a0 = 1. at is a random variable. 1. Assume we have an initial value yo. Express y1, y2, y3, 3/4, and y5 in terms of only 611, yo, and er (and the lags of et if necessary). 2. More generally, find the solution for yr, (i.e., solve yt as a function of a0, 0.1, at and lags of et) for the time series above by assuming that there is an initial value yo. 3. Comment on the different shapes of the time series yt when 011 = 1 vs. |a1|