Answer:
I think it's 10 or 10.5 not sure
Step-by-step explanation:
 
        
             
        
        
        
3x + 4y = -5 
-3x              -3x
4y= -3x -5
/4      /4
y= -3/4x-5/4
3x + 3y = -2
-3x             -3x
3y = -3x-2
/3       /3
y= -1x-2/3
        
             
        
        
        
18 = (240/100) x what;
what = 18 x (100/240);
what = 1800/240;
what = 7.5;
        
                    
             
        
        
        
It is 10x4x3x2 equals two hundred and forty
        
             
        
        
        
The equations we get are
l = 6 + 2w (We get this from "The length of the rectangle is 6 more than 2 times the width.")
and
2l + 2w = 140 (We get this from the perimeter. Two times the length plus two times the width equals the perimeter of a quadrilateral.)
The first equation can be written as
l - 2w = 6
So now we have
2l + 2w = 140
l - 2w = 6
____________
Add the two equations.
We get 3l = 146
Divide by 3 on both sides.
l = 
48
Your answer is 
48
.