Answer:
Part A, one solution
Part B, x=3
Step-by-step explanation:
divide both sides of the equation by 7 (5x-13=2)
move the constant to the right hand side and change its sign (5x=2+13)
add numbers (5x=15)
divide both sides of the equation by 5  (x=3)
hope this helps, have a good day
 
        
             
        
        
        
First one!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!11111111111111111111111111111111111111
        
                    
             
        
        
        
Answer:
b=9,a=12
Step-by-step explanation:
I solved by substitution:
b = 3/4a  ---> plug this into the other equation
a + b = 21   is now    a + 3/4a = 21
Reduce: 7/4a = 21
a = 12
Now solve for b:
b=3/4a is now b=3/4(12)
b=9
 
        
                    
             
        
        
        
The center is 87 yeah yeah yeah
        
             
        
        
        
Problem
 8 over 3
g over 3
Cross multiply 
8 × 3 = 24
g × 3 = 3g
__________
24 × 3g 
---     ----
  3       3
                        (Cross out "3g" and "3" on the right )
Then "divide" 24 and 3. It should leave you with 8
Your answer: g= 8