Answer with Step-by-step explanation:
We have to prove that 
 is true for all sets A and B
 is true for all sets A and B
Let 
Then  or
 or 
 and
 and  or
 or 
Hence,  
 
Conversely ,Let 
Then x belongs to A and x does not belongs to B then 
x belongs to A- B
Or  x belongs to A and x belongs to B then x belongs to 
Hence, 
Therefore, 
 
        
                    
             
        
        
        
Answer:
10 
Step-by-step explanation:
 
        
             
        
        
        
(0.5, 1.3) is the correct answer
Step-by-step explanation:
Given equations are: 

As we can see that the given equations are linear equations which are graphed as straight lines on graph. The solution of two equations is the point of their intersection on the graph.
We can plot the graph of both equations using any online or desktop graphing tool.
We have used "Desmos" online graphing calculator to plot the graph of two lines (Picture Attached)
We can see from the graph that the lines intersect at: (0.517, 1.267)
Rounding off both coordinates of point of intersection to nearest tenth we get
(0.5, 1.3)
Hence,
(0.5, 1.3) is the correct answer
Keywords: Linear equations, variables
Learn more about linear equations at:
#LearnwithBrainly
 
        
                    
             
        
        
        
Answer:
D. 13 1/2 
Step-by-step explanation:
2/3 x -2 = 7
2/3 x -2 + 2 = 7 + 2
2/3 x = 9
x = 9 (3/2)
x = 27/2
x = 13 1/2
 
        
             
        
        
        
Answer:
Step-by-step explanation:
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