The inequality used to solve for x is x=750/15
        
             
        
        
        
Answer:
52
Step-by-step explanation:
If u=(a1i+b1j)=(a1,b1) and v=(a2i+b2j)=(a2,b2), then the dot (scalar) product is:
u.v=(a1,b1).(a2,b2)
a1b1+a2b2
 u.v=(8,-7).(3,−4)
(8)(3)+(-7)(−4)
24+28=52
 
        
             
        
        
        
Fill your inequality in with the y and x provided and then do the math.  (4, -1) would fill in like this (I will use brackets to indicate absolute value symbols, since there are none in the equation editor): 
![-1\ \textgreater \ [4]-5](https://tex.z-dn.net/?f=-1%5C%20%5Ctextgreater%20%5C%20%5B4%5D-5)
  The right side is in fact equal to the left side so that's not the answer.  For (-1, -4): 
![-4\ \textgreater \ [-1]-5](https://tex.z-dn.net/?f=-4%5C%20%5Ctextgreater%20%5C%20%5B-1%5D-5)
 and these are also equal.  Let's try C now (-4, 1): 
![1\ \textgreater \ [-4]-5](https://tex.z-dn.net/?f=1%5C%20%5Ctextgreater%20%5C%20%5B-4%5D-5)
.  The absolute vale of -4 is 4 so 4 - 5 = -1 which is, in fact, less than 1.  So C is our answer.
 
        
        
        
Divide across and just bring down the numbers
        
             
        
        
        
The answer is 5 and 0
(-5) + 5 = 0