How would I solve this?

Section 11.7: Problem 3 (1 point) Each of the following functions has at most one critical point. Graph a few level curves and a few gradiants and, on this basis alone, decide whether the critical point is a local maximum (MA), a local minimum (MI), or a saddle point (S). Enter the appropriate abbreviation for each question, or N if there is no critical point. 1. f(x, y) = e 31 212 Type of critical point: 2. f(I, y) = 373 212 Type of critical point: 3. f(x, y) = 3x2 + 232 + 4 Type of critical point: 4. f(x, y) = 3x + 2y + 4 Type of critical point: Note: You can earn partial credit on this