Determine the slope of the line that contains each given pair of points. Choose the correct answer.
|     | 
 | 
                                   −4
                                
							
                                  4
                                
                            
                            	Answer: 
                            	
                                	
                                
                           	
                       	|     | 
 | 
                            	Answer: 
                            	
                                	
                                
                           	
                       	|     | 
 | 
                                    −8
                                
							
                                   0
                                
                            
                                    8
                                
                            
                                  undefined
                                
                            
                            	Answer: 
                            	
                                	0
                                
                           	
                       	|     | 
 | 
                                    −3
                                
							
                                   0
                                
                            
                                    3
                                
                             
                                  undefined
                                
                            
                            	Answer: 
                            	
                                	undefined
                                
                           	
                       	