Answer would be 140 why does my answer need to be 20 words long ugh
        
                    
             
        
        
        
<h3>
Therefore they are perpendicular.</h3>
Step-by-step explanation:
A equation of line is
 y =mx +c 
Here the slope of the line is m.
Given equations are 
x - 2y = 18 
⇔-2y = -x +18
 ............(1)
............(1)
and 2x + y = 6
⇔y = -2x +6 ............(2)
Therefore the slope of equation (1) is =
= 
Therefore the slope of equation (2) is = -2
= -2
 If two lines are perpendicular, when we multiply their slope we get -1.
therefore,
 =
 = . (-2) = -1
. (-2) = -1
Therefore they are perpendicular.
 
        
        
        
 number 9 =al you have to do is one and 7 eighths =9 so your sum will be 10 and 7 eighths.
hope this helps;)
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YOU PROMISED!
 
        
                    
             
        
        
        
The answer is,

Also equivalent to about, 0.185188.