Q. If xy+2x=−2+2y then find dxdy in terms of x and y.Answer: dxdy=
Given equation differentiation: We are given the equation xy+2x=−2+2y. 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).
Left side differentiation: Differentiate the left side of the equation with respect to x. The term xy is a product of x and y, so we use the product rule: dxd(uv)=udxdv+vdxdu. Here, u=x and v=y, so we get xdxdy+y(1). The term 2x is straightforward: the derivative of 2x with respect to x is xy1.
Right side differentiation: Differentiate the right side of the equation with respect to x. The term −2 is a constant, so its derivative is 0. The term 2y is a function of x, so we get 2dxdy.
Write down differentiated equation: Now we write down the differentiated equation: xdxdy+y+2=2dxdy.
Solve for dxdy: We need to solve for dxdy. To do this, we'll collect all the terms containing dxdy on one side and the other terms on the opposite side. Subtract xdxdy from both sides to get: 2dxdy−xdxdy=y+2.
Factor out dxdy: Factor out (dxdy) from the left side: (dxdy)(2−x)=y+2.
Divide to solve for dxdy: Divide both sides by (2−x) to solve for dxdy: dxdy=2−xy+2.