Answer:
a) 0.001 meters
b) 1 millimeter because 1 mm = 0.001 meters as well
Step-by-step explanation:
 
        
             
        
        
        
Well if you're wanting to use substitution, you first have to end up with one term on either side of the equation. Use the second one as it's easiest. 
So: x-2y=11, so find -2y as there is a -2y in the first equation. 
then that becomes -2y=11-x. then sub that into equation 1, and you get:
-x+11-x=-13, which equals to -2x+11=-13, which is -2x=-24, so therefore
x=12. then chuck the x into any of the equations to find what y equals. 
hope this helps!
        
             
        
        
        
The reason why the trails must be in quadrant 2 or 3 is because the coordinates start with a negative number. Quadrant 2= (-,+) and quadrant 3= (-,-)
        
             
        
        
        
Answer:
36
Step-by-step explanation: