1. (I)Graphs of the Form  xfy 
    0ifdefinedonlyis  xfxf
   
noticing;and
drawingfirstbysketchedbecanofgraphThe xfyxfy 

2.  xfy 
y
x
1
-1

3. (I)Graphs of the Form  xfy 
    0ifdefinedonlyis  xfxf
   
noticing;and
drawingfirstbysketchedbecanofgraphThe xfyxfy 
  domainin theallfor0 xxf 
            1ifand1if  xfxfxfxfxfxf

4.  xfy 
y
x
1
-1

5. (I)Graphs of the Form  xfy 
    0ifdefinedonlyis  xfxf
   
noticing;and
drawingfirstbysketchedbecanofgraphThe xfyxfy 
  domainin theallfor0 xxf 
            1ifand1if  xfxfxfxfxfxf
 
 
implies;
xf
xf
dx
dy 

pointsstationarybestillmustpointsstationary
  0wherepointscriticalarethere  xf

7.  xfy 
y
x
1
-1
 xfy 

8.  xfy 
y
x
1
-1
 xfy 

9. y
x
1
-1
 xfy 2