Answer:
A) -4x + 9y = 9 
B) x -3y = -6
We multiply B) by 3
B) 3x -9y = -18 Then add it to A)
A) -4x + 9y = 9
-x = -9
x = 9
9 -3y = -6
3y = 15
y = 5 
Step-by-step explanation:
 
        
             
        
        
        
If A varies directly with z, and A is 30 and z is 5, then when z is 1, A is 6.
z: 5 ÷ 5 = 1
A: 30 ÷ 5 = 6
Then, when z is 1, A is 6
So, when z is 9, A is...
z: 1 × 9 = 9
A: 6 × 9 = 54
A is 54
        
                    
             
        
        
        
Answer:
(-4, -3) 
(-4,3) 
(4,3) 
The clock wise rotation of the coordinate will be 
(3,4) 
(3,-4)
(-3,-4) 
(-3,4)
 
        
                    
             
        
        
        
Answer: -2log(2) or -0.60206 
Explanation: 
log(1/4)
= log(2^2)
= - 2log(2)