dy Find by implicit differentiation. dx 6x + y = 9 Recall that the first step in finding dy dx by implicit differentiation is to differentiate both sides of the equation with respect to x. In other words, for the given equation 6x2 + y = 9 we must find the following. (6x + y)=(9) dx Using the sum rule for differentiation allows us to rewrite the left side of the equation as follows. d dx d (y) d (9) dx dx