Answer:
    Step One: Identify two points on the line.
    Step Two: Select one to be (x1, y1) and the other to be (x2, y2).
    Step Three: Use the slope equation to calculate slope. 
Step-by-step explanation:
 
        
             
        
        
        
Step-by-step explanation:
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i hope u may understand 
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No.
If a rational number can be an integer, x and y could be 5.5 and .5, or something that adds up to (number).0.  This means, if the two non-rational numbers add up, they could be irrational, but the result isn't.