A line with a slope of -7 passes through the points (u,0) and (8,-7) what is the value of u?
       
      
                
     
    
    
    
    
    1 answer:
            
              
              
                
                
Answer:
u = 7
Step-by-step explanation:
Using the slope intercept formula:

Substitute our values from the points and the known slope:

Now we multiply both sides by (8 - u) to isolate the x:
(8-u) x  = -7 (8 - u)
 = -7 (8 - u)
Next we add 56 to both sides:
-7 = -56 + 7u
Finish off by dividing both sides by 7:
7u = 49
u = 7
 
                                
             
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