Answer:
x = 1, y = -2, z = 3.
Step-by-step explanation:
x + 2y + 2z = 3      A
2x -2y - z = 3         B
x - 2z = -5              C
If we add equations A and B we eliminate y:
3x + z = 6       E
Multiply E by 2 :
6x + 2z = 12    F
Adding C and F we get:
7x = 7
x = 1.
Plug this into equaton C:
1 - 2z = -5
-2z =  -5 - 1 = -6
z = 3. 
Now plugging x = 1 and z = 3 in equation A:
1 + 2y + 2(3) = 3
2y = 3 - 1 - 6 = -4
y = -2.
 
        
             
        
        
        
Answer:
(4,3) (4,5)
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:7.967
Step-by-step explanation:
 
        
                    
             
        
        
        
20/28 = 3x / (4x + 2)
84x = 20(4x + 2)
84x - 80x =  40
4x = 40 
x = 10
so the 2  lines are equal to  30 and  42