Suppose we have a system of change equations for variables X and Y. The only X-nullcline is a line with a positive slope. In other words, the equation for the X-nullcline can be written as Y = mX + b where m > 0. Which of the following change equations could be a differential equation for our system? Selected answer will be automatically saved. For keyboard navigation, press up/down arrow keys to select an answer.
a. X' = X
b. X' = Y
c. X' = X + 1 + Y
d. X' = X +1 - Y
e. X' = 0