Estimate gradient from a graph

Press these keys

Walkthrough

1. 1
   Graph the function

   Choose a window that makes local shape visible.

2. 2
   Draw tangent

   Use 2nd → PRGM (DRAW) → Tangent(, then select the point or enter its x-value.

3. 3
   Read equation

   The displayed line has form y=ax+b; a is the numerical gradient.

Worked example