Problems 61–70. The purpose of these problems is to keep the material fresh in your mind so that you are better prepared for later sections, a final exam, or subsequent courses such as calculus.

The normal line is the line that is perpendicular to the tangent line at the point of tangency. If y = −2x + 2 is the tangent line to f (x) = 1/3 x² − 4x + 5, find an equation of
the normal line to f at the point of tangency.