Prerequisite concepts New prereq concept lower anchor MTH 251 New taught by Single variable chain rule If $f=f(y)$ and $y=y(x), then \frac{df}{dy}=\frac{df}{dx}\frac{dx}{dy}.$ Representations used No activity! NEEDS NAME $\frac{d f}{d x}$ ENTER LONG DESCRIPTION New representation Chain Rule A partial derivative can be expressed in terms of other partial derivatives FIXME New needed for concept