What does perpendicular mean? Well, in elementary geometry it mean 2 lines that intersect at a right angle. (90°).
So for Part one. all you need to do is draw a straight line down from the point X. Name the end point of that line M. 
Now you will connect the line M and Z.
Thats it! I hope this helped!! :)
        
                    
             
        
        
        
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Hope this helps!
 
        
             
        
        
        
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Where is the function shown below?
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you will most likely get red???
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