(1.1) Determine whether the system x + y + x + y = 2e³t, x + y − 3x − 3y = −e¯², is degenerate. In the degenerate case, decide whether it has no solution or infinitely many solutions. If it has no solution, explain why, else find the general form of the solutions. (1.2) Solve the system: x + x = 2y = 2t², 2x − x + y − 2y = 2t³, by using the elimination method (operator method). Hint. Eliminate y first.