Answer:
the first one 
Step-by-step explanation:
obviously
 
        
             
        
        
        
Answer:
TeX, stylized within the system as TeX, is a typesetting system which was designed and written by Donald Knuth and first released in 1978. TeX is a popular means of typesetting complex mathematical formulae
Step-by-step explanation:
TeX, stylized within the system as TeX, is a typesetting system which was designed and written by Donald Knuth and first released in 1978. TeX is a popular means of typesetting complex mathematical formulae
 
        
                    
             
        
        
        
9 yards is about 8 meters
        
             
        
        
        
Answer:

Step-by-step explanation:
A line is perpendicular to another if its slope is the negative reciprocal of the other. 
Your lines are in slope intercept form here, y=mx+b, where m is the slope. We can see the given line has slope  . The negative reciprocal of that is
. The negative reciprocal of that is  , which is the slope of the third answer choice.
, which is the slope of the third answer choice.