2(cid:19) , is (a) c1e4t (cid:18) 1 (b) c1e2t (cid:18) 1 (c) c1e2t (cid:18) 1 (d) c1e4t (cid:18) 1. 1: a nonlinear system is given by. The number of equilibrium points for this system is (a) three. (b) one. (c) two. (d) four: for the system x = x2. Y, the point at (1, 0) is a (a) saddle. (b) focus. (c) unstable node. (d) stable node: which of the following are linear equations? (1) y + sin y = 1. (2) y . Y + ety = 0. (3) y /y = t2. (4) t5y + t4 = cos t. (a) all of the above. (b) (2) only. (c) (2) and (4). (d) (2),(3), and (4). 2: which of the following plots shows the solution of the problem y + 4y + y = 0, y(0) = 1, y (0) = 0? (a) (c) (b) (d)
