Steps 
Key Sequence 
Screens 
1. Input Function, PiecewiseDefined Function, or Parametric Equation. 
Press DIAMOND key, then F1 key (for Y=) 


Type the function 

2. Graph 
Press DIAMOND key, then F3 key 

3. Find Tangent Line 
Press F5 


Press ALPHA, then = key (for Tangent) 


Type in value for x or trace function until you reach the value for x 

Note: In this case, we are finding tangent line to curve at x = 3. 
Note: For parametric equations, type in value for t or trace function until you reach the value for t. 

Press ENTER 

Note: In this case, the equation of the tangent line to curve at x = 3 is
y = –6x + 14. 