Solution
= 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
$$
\boxed{\text{slope}=-1.}
$$
= 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
$$
\boxed{\text{slope}=-1.}
$$