Chapter 2 - The Derivative - 2.1 Tangent Lines And Rates Of Change - Exercises Set 2.1 - Page 120: 8

The answer is given in the graph.

One simple example is given by the line $L: y=x+2$ and the curve $y=f(x): y=x^{3}$. There is only one intersection point and it is given by the solution $x^{3}=x+2$ which has only one real root x=1.69562.