1. (4 points) Use Cramer's rule to solve the system below, and state the condition at which solution exists. artby = 1 er+dy =-1 Note: a, b, c, d are parameters. 2. (6 points) Compute limits. 12 - 2x (a) lim (b) lim Var2- 1+ (e is Euler's number). ex-1 + 35. (3 points) Given function f(x) = 2. Obtain the equation for tangent line of function f(x) at point = = -2