**III. Working With A Graph**

B. MATH

2. dy/dxThis is a calculus application. dy/dx gives a numerical approximation of the first derivative at the indicated point. You can use trace to get to the x-value or you can enter a value of x.

Example: Find the numerical derivative at x=1 and x=-1.

Enter the function. Graph with

ZDECM. dy/dx:

Enter x=-1. dy/dx at x=-1 dy/dx at x=1