Answer:

Step-by-step explanation:
We can write the equation of a line in 3 different forms including slope intercept, point-slope, and standard depending on the information we have. We have a point given and a slope from the equation. We will chose point-slope since we have a point and the slope.  
We will substitute  and
 and  .
.
 

This is the equation of the line with slope -2 that passes through (5,-1).
 
        
             
        
        
        
B. Y equals 0, because if you plug it in ( multiply 2 by 9 ) you will get 18-18 which equals 0.
        
             
        
        
        
Answer:
no it is not a right angle triangle 
 
        
                    
             
        
        
        
11 is your answer because 11* 11 is 121