(a) Identify the nullclines (see Problem 17) in Problems 1, 3, and 4. With a colored...

(a) Identify the nullclines (see Problem 17) in Problems 1, 3, and 4. With a colored pencil, circle any lineal elements in Figures 2.1.12, 2.1.14, and 2.1.15 that you think may be a lineal element at a point on a nullcline.

(b) What are the nullclines of an autonomous first-order DE?

(reference figure 2.1.12 and 2.1.14)