# Write the y - 4y + y 3 = 0 as a system, solve it for y 2 as a function of y 1 , and sketch or graph some of the trajectories in the phase plane. -2 C = 3 C = 4 ON 2 C=5 Fig. 98. Trajectories in Problem 15 Y

Chapter 4, P R O B L E M S E T 4 . 5 #15

Write the y" - 4y + y^{3} = 0 as a system, solve it for y_{2} as a function of y_{1}, and sketch or graph some of the trajectories in the phase plane.

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