### Home > APCALC > Chapter 9 > Lesson 9.2.2 > Problem9-64

9-64.

No calculator! Determine the slope of the curve $x \cos(y) = xy + 1$ at the point $(1, 0)$. Homework Help ✎

First: Implicitly differentiate: $cos(y)-xsin(y)y^\prime=y+xy^\prime$

Second: Solve for $y^\prime$.

Third: Evaluate the equation for $x = 1$ and $y = 0$.