Answer:
1)   
2)   
3)  see below
4)  A:  0 = 1
Step-by-step explanation:
<u>Question 1</u>





<u>Question 2</u>








<u>Question 3</u>
subtract the second equation from the first
divide both sides by -4
substitute found value for y into first equation
solve for x
<u>Question 4</u>






Solution = A
 
        
             
        
        
        
Correct option is A. Money saved is  ′ $6 ′ .
Given
Regular price of the refrigerator = $600
i) Buying the refrigerator at 20 percent off regular price
Final Discount in this case = 20% (Regular price of the refrigerator)
= 20 / 100 × 600
= $120
ii)  Buying it on sale at 10 percent off regular price and an additional 10 percent off sale price
Discount for the sale = 10% (Regular price of the refrigerator)
=  10/100  × $600
= $60
Sale price of the refrigerator = Regular price of the refrigerator − Discount for sale
= $600 − $60
= $540
Final Discount in this case = 10% (Sale price of the refrigerator)
= 10/100  × $540
= $54
Money saved if we buy as (case−i) = (Final Discount in (case.i)) − (Final Discount in (case.ii))
= $60 − $54
= $6
Therefore, Money saved is  ′ $6 ′ .
To learn more about percentage from given link
brainly.com/question/24304697
#SPJ4
 
        
             
        
        
        
Answer:
heyyyyyyy
Step-by-step explanation:
 
        
             
        
        
        
I believe the answer is 4.
 
        
                    
             
        
        
        
Answer:
(3,4)
Step-by-step explanation:
The system of equations is:
x+6y=27
7x-3y=9.
I looked up "metodo de igualacion". It is basically American for doing substitution. 
However, the only difference is you are asked to solve both equations for a variable. 
The first equation looks easy to solve for x. So I'm going to solve both equations for x.
x+6y=27
Subtract 6y on both sides:
x     =-6y+27
7x-3y=9
 Add 3y on both sides:
7x    =3y+9
 Divide both sides by 7:
 x     =3/7 y +9/7
So both equations are solved for x.  You want to find when the x's are the same because you are looking for a common amongst the lines given.
So we have
-6y+27=3/7 y  +9/7
I hate the fractions honestly so I'm going to multiply both sides by 7 so they will no longer be for now:
-42y+189=3y + 9
Now add 42y on both sides:
          189=45y+9
Subtract 9 on both sides:
         180=45y
Divide both sides by 45:
             4=y
If 4=y, then y=4.
So now once we have obtain 4 for y, we will use one of the equations given along with it to find x. Just choose one. Choose the easier looking one to you.
I like the x=-6y+27 with y=4.
So replace y with giving you:
x=-6(4)+27
x=-24+27
x=3
So the solution is (x,y)=(3,4).
x=3 and y=4.