### Home > CALC > Chapter Ch7 > Lesson 7.1.4 > Problem 7-46

7-46.

Use implicit differentiation.

A tangent line will be vertical where the denominator of the derivative = 0.

Since the denominator has both *x* and *y* values, there will be infinitely many ways to make the denominator equal to 0.

But only some (or one) of those ways fit the given curve.