Answer:
y=-5,x=2
Step-by-step explanation:
3x+3y=-9________________eqn 1
3x-3y=21________________eqn 2
using elimination method
 3x+3y=-9
-
 3x-3y=21
subtract equation 2 from equation 1 
0+6y=-30
6y=-30
y=-30/6
y=-5
substitute the value of  y  in equation 1
3x+3y=-9
3x+3(-5)=-9
3x-15=-9
3x=-9+15
3x=6
x=6/3
x=2
 
        
             
        
        
        
3/36 o 1/12 <span>oportunidad</span>
        
             
        
        
        
Answer
I am positive it us 4x = 14 I truly apologize if it's not. 
Step-by-step explanation
        
             
        
        
        
Answer:
Step-by-step explanation:
14 MAY BE