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Can this differential equation be solved using separation of variables?

(dy)/(dx)=10-2y+9x
Choose 1 answer:
(A) Yes
(B) No

Can this differential equation be solved using separation of variables?\newlinedydx=102y+9x \frac{d y}{d x}=10-2 y+9 x \newlineChoose 11 answer:\newline(A) Yes\newline(B) No

Full solution

Q. Can this differential equation be solved using separation of variables?\newlinedydx=102y+9x \frac{d y}{d x}=10-2 y+9 x \newlineChoose 11 answer:\newline(A) Yes\newline(B) No
  1. Check Equation Form: To determine if the differential equation (dydx=102y+9x)(\frac{dy}{dx} = 10 - 2y + 9x) can be solved using separation of variables, we need to see if we can express the equation in the form of (dyg(y)=f(x)dx)(\frac{dy}{g(y)} = f(x)\,dx), where g(y)g(y) is a function of yy only and f(x)f(x) is a function of xx only.
  2. Rearrange Equation: We attempt to rearrange the equation to isolate terms involving yy on one side and terms involving xx on the other side. The given equation is dydx=102y+9x\frac{dy}{dx} = 10 - 2y + 9x.
  3. Isolate Terms: We try to move the term involving yy to the left side of the equation and the term involving xx to the right side of the equation. This would give us dydx+2y=10+9x\frac{dy}{dx} + 2y = 10 + 9x.
  4. Check Functionality: Now, we check if the left side of the equation is only a function of yy and the right side is only a function of xx. The left side, dydx+2y\frac{dy}{dx} + 2y, is not solely a function of yy because it contains the derivative term dydx\frac{dy}{dx}. The right side, 10+9x10 + 9x, is solely a function of xx.
  5. Final Conclusion: Since the left side of the equation is not solely a function of yy, we cannot separate the variables as required for the method of separation of variables. Therefore, the differential equation cannot be solved using separation of variables in its current form.

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