Determine the slope of each given line. Choose the correct answer.
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                            	Answer: 
                            	
                                	
                                    
                                
                           	
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                            	Answer: 
                            	
                                	
                                    
                                
                           	
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                                    −4
                                
							
                                  4
                                
                            
                            	Answer: 
                            	
                                	
                                    
                                
                           	
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                                    0
                                
							
                                    5
                                
                             
                                  undefined
                                
                            
                            	Answer: 
                            	
                                	undefined
                                
                           	
                       	|     | 
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                                    0
                                
                             
                                  undefined
                                
                            
                            	Answer: 
                            	
                                	0
                                
                           	
                       	