Thinking About Functions
 Topic Index | Algebra2/Trig Index | Regents Exam Prep Center

 

Examine the following equations to determine if y is a function of x, using your graphing calculator.


1.  Decide whether y is a function of x:    
Sample answer:  Solve the equation for y and examine the graph and/or the table of values.


This is a straight line.

Yes, y is a function of x.

Graph passes the vertical line test
for functions.

A table shows that each x value
has one and only one y value.
 

  

 2.  Decide whether y is a function of x:    
   

 

3.  Decide whether y is a function of x:    

 


4.  Based upon your findings from the examples above, make a statement about what types of relations can be entered in the Y= section of the graphing calculator.