He made the first error in number 3
        
                    
             
        
        
        
Answer:
x = 7, y = 30  and  x = 3, y = 10
Step-by-step explanation:
5x - y = 5, then y = 5x - 5
2y - x^2 = 11
2(5x - 5) - x^2 = 11
10x - 10 - x^2 = 11
-x^2 + 10x -10 = 11
-x^2 + 10x -21 = 0
x^2 - 10x + 21 = 0
(x - 7)(x - 3) = 0
x = 7, y = 30
x = 3, y = 10
 
        
             
        
        
        
Answer:
lesser x is 1
greater x is 3
Step-by-step explanation: 
Here, we want to solve the equation so as to get the bigger and the lesser x values
We proceed as follows;
x^2 -4x + 3 = 0
x^2 - x-3x + 3 = 0
x(x-1) -3(x-1) = 0
(x-3)(x-1) = 0
x = 3
or x = 1 
Greater x is 3
lesser x is 1 
 
        
             
        
        
        
Its A because my class is litterally studing that now