Multiply first equaton by -1 and add to first
-2x+y=7
<u>4x-y=-4 +</u>
2x+0y=3
2x=3
divide 2
x=3/2
sub
2x-y=-7
2(3/2)-y=-7
3-y=-7
minus 3
-y=-10
negative 1 times both sides
y=10
(3/2,10)
(1.5,10)
B is ansre 
        
             
        
        
        
Answer:
i think its -1 box but im not sure
Step-by-step explanation:
 
        
                    
             
        
        
        
The answer would be = <span>10.3333333
</span>
        
             
        
        
        
Object a: 
perimeter is all the sides added together! 
9+9=18
4.1+4.1= 8.2
18+8.2=36.2
object A’s perimeter is 36.2 CM
————————————————————
object b: 
7.2+3+ 3.6= 13.8
object B’s perimeter is 13.8 CM
————————————————————
hope this helped! xoxo