A DE deduced from the direction field

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SUMMARY

The discussion focuses on identifying the correct differential equation corresponding to a given direction field. The options presented include five different equations: y' = x + y, y' = xy - 1, y' = 1 - xy, y' - xy, and y' = x - y. The participant expresses confusion regarding deducing the differential equation when the equilibrium solution is not horizontal and seeks clarification on the conditions under which y' equals zero in the direction field.

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  • Understanding of differential equations and their graphical representations.
  • Familiarity with direction fields and equilibrium solutions.
  • Knowledge of the concept of derivatives in the context of y' notation.
  • Basic skills in analyzing mathematical functions and their behavior.
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  • Study the method for deducing differential equations from direction fields.
  • Learn about equilibrium solutions and their significance in differential equations.
  • Explore graphical techniques for analyzing differential equations.
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Students studying differential equations, educators teaching mathematical analysis, and anyone interested in understanding direction fields and their applications in solving differential equations.

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Homework Statement



Which of the following di erential equations corresponds to the direction eld
shown below?

1) y'=x+y
2) y'=xy-1
3) y'=1-xy
4) y'-xy
5) y'=x-y


Homework Equations





The Attempt at a Solution



I have no idea how can this be done. I mean I used to deduce the DE from the direction field only when the equilibrium solution was HORIZONTAL.. Now, I am confused! Anyone who would help, I would appreciate it.
 

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For what (x,y) is y'=0 in the picture?
 

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