Find dy/dx by Implicit differentiation. X^5 + y^8 = 9 When finding dy/dx = y' by implicit differentiation, we consider y to be a function of x. This means that whenever a derivative Is calculated for an expression that includes the variable y, the Chain Rule requires that we multiply the derivative by y'. For example, d/dx [y^2] = (2y) (y'). Similarly, d/dx [y^8] =