[ 2x + y = -9 ] x -3
[- 3x +11= y ] x 2
-6x -3y = 27 
-6x + 22 = 2y 
-6x +27 = 3y
-6x +22 = 2y 
5 = y 
-6x -3x5 = 27
-6x -15 = 27
-6x = 42
-x = 42/6
-x = 7
x = -7 
answer 
x = -7
y = 5
        
             
        
        
        
Answer:3,500
Step-by-step explanation:
 
        
             
        
        
        
18 x 40 = 720 per week.....720 x 4 = 2880 per month earnings
net pay = 0.72(2880) = 2073.60 <=== cash inflow.
how much he spends per month is his cash outflow.
        
                    
             
        
        
        
Answer:
400
Step-by-step explanation:
use proportions
(60/x) * (15/100)
cross multiply
6000=15x
divide both sides by 15
400=x