Answer:
Add -4x to both sides--> 6x+9=4x-3 and 2x+9=-3
multiply both sides by -1/4 --> -4(5x+7)=-18 and 5x-7=4.5
multiply both sides by 1/4--> 12x+4=20x+24 and 3x+1=5x+6
multiply both sides by -4--> -5x/4=4 and 5x=-16
add -4 to both sides--> 8-10x=7+5x and 4-10x=3+5x
 
        
             
        
        
        
Answer:
a) 9.135
b) 392.79
Step-by-step explanation:
Hope my answers are helpful
 
        
                    
             
        
        
        
Step-by-step explanation: 2 per hour and per person because 8 x 5 is 40 so 400 divided by 40 equals 10 so then 10 divided by 5 is 2 so 2 per hour 
 
        
             
        
        
        
Step-by-step explanation:
Make sure to see the photo I tried to explain every part there