We can solve this equation by completing the square. Notice that 

 and 

. Therefore, we can turn 

 into 

. y, in this equation, only has one real solution: 4. So your answer would be (B).
 
        
        
        
Answer:
Step-by-step explanation:
In order to do this we need to isolate y by performing the inverse operations on the other values like so...
a)   10x + 5y = 20   ... subtract 10x on both sides
      5y = 20 - 10x    ... divide both sides by 5
        y = 4 - 2x   ... we can move the 2x to the right to make it into y = mx + b
        y = -2x + 4
b)   3x - 2y = 10 + 4x   ... subtract 3x on both sides
       -2y = 10 + x    ... divide both sides by -2
        y = -5 - 0.5x  ... move -0.5 to the left so it matches y = mx + b
        y = -0.5x - 5
 
        
             
        
        
        
Answer:
3300 Ghana cedis
Step-by-step explanation:
There are 2000 items, so n = 2000
P = 3/4 * 2000 + 1800 = 1500 + 1800 = 3300 Ghana cedis
 
        
             
        
        
        
The answer is 9 
     12 ounces x
--------------- = ----------------
10 pounds of soil 120 pounds of soil
Set the equation up as a proportion and solve for x:
10x = 1440
---- -----
10 10
x = 144 ounces
The question asks for the answer in pounds, and 16 ounces = 1 pound.
144/16 = 9