Q. If −2y−1−x=−xy then find dxdy in terms of x and y.Answer: dxdy=
Differentiate left side with respect to x: We are given the equation −2y−1−x=−xy. To find dxdy, we need to differentiate both sides of the equation with respect to x, treating y as a function of x (implicit differentiation).
Differentiate right side with respect to x: Differentiate the left side of the equation with respect to x. The derivative of −2y with respect to x is −2dxdy because y is a function of x. The derivative of −1 with respect to x is 0, and the derivative of x0 with respect to x is −1.
Combine differentiated equations: Differentiate the right side of the equation with respect to x. The derivative of −xy with respect to x is −y−x(dxdy) because we use the product rule for differentiation (dxd of u⋅v=u⋅(dxdv)+v⋅(dxdu), where u=−y and v=x).
Isolate terms with (\frac{dy}{dx}): Now we have the differentiated equation: \(\(-2(\frac{dy}{dx}) - 1 = -y - x(\frac{dy}{dx}).
Add xdxdy and 1: We need to solve for dxdy. To do this, we'll collect all the terms involving dxdy on one side of the equation and the constant terms on the other side.
Combine like terms: Add xdxdy to both sides and add 1 to both sides to isolate terms with dxdy on one side: −2dxdy+xdxdy=−y+1.
Divide both sides to solve: Combine like terms: (−2+x)(dxdy)=−y+1.
Divide both sides to solve: Combine like terms: (−2+x)(dxdy)=−y+1.Now, divide both sides by (−2+x) to solve for (dxdy): (dxdy)=−2+x−y+1.