Answer:
D=-4<0, the equation has no real solutions, it has two imaginary solutions.
Step-by-step explanation:
The quadratic equation 
 has coefficients 
a=1,
b=4, 
c=5.
The discriminant D is the expression 

Hence,

Since the discriminant is negative, the equation has no real solutions, it has two imaginary solutions.
 
        
                    
             
        
        
        
Answer: 1
Step-by-step explanation:
16 * 1/2 = 8
7x + 1 = 8
7x = 7
x = 1
 
        
                    
             
        
        
        
The third one.
Because the answer of the absulate value equations is always positive.
        
                    
             
        
        
        
y - 0 = 5(x-4)
   y = 5x-20
   5x - y = 20  Standard Form  
 
        
             
        
        
        
Its 1/7 because parallel lines have the same slope