 Solution

ID: past-exam-of-the-mathematics-course-of-the-year-1-of-the-natural-sciences-course-of-the-university-of-cambridge/2019/paper-1/3/b/solution

The normal vector direction is orthogonal to the tangent line. For finite nonzero slopes, their product is

- 1

. The tangent has slope one, so the normal line has

slope = - 1.

 New to topics? Read the docs here!